01Role and principlesWho benefits and the main preventive aims.
Postpartum contraception works best when it is discussed during pregnancy, chosen voluntarily and made available before discharge. Ask about desired spacing, breastfeeding, prior methods, bleeding, procedures and whether a private conversation is needed. Do not treat contraception as a condition of maternity care or infer a choice from parity. Short interpregnancy intervals can increase obstetric risk, but this supports better access and informed counselling, not pressure towards a long-acting or permanent method.
Progestogen-only contraception can begin immediately after birth. A POP or etonogestrel implant provides early reversible cover and is compatible with breastfeeding. DMPA may also be given immediately when eligible, but explain that it cannot be removed, may affect bleeding and bone density and can delay fertility return after the final injection. Condoms can be used when comfortable. A diaphragm or cap requires refitting after anatomical recovery and is generally deferred for six weeks.
Intrauterine contraception has two postpartum windows: placement within 48 hours, including immediately after vaginal birth or during caesarean, or interval insertion from four weeks. Placement between 48 hours and four weeks carries higher perforation and expulsion concerns and is not routine. Immediate postpartum insertion improves access but has a higher expulsion rate than interval placement; provide thread and expulsion advice and a pathway for localisation. Breastfeeding and insertion within 36 weeks of birth increase perforation risk, although absolute risk remains low.
CHC eligibility changes quickly after birth. In non-breastfeeding patients before three weeks it is UKMEC 4 with another VTE factor and category 3 without one; from three to six weeks it is category 3 with another factor and 2 without; from six weeks the postpartum classification is 1. Breastfeeding independently makes CHC category 4 before six weeks, category 2 from six weeks to under six months and category 1 from six months. Assess caesarean, immobility, haemorrhage, transfusion, pre-eclampsia, BMI, smoking and thrombotic history and bridge with an eligible non-oestrogen method.
After abortion, miscarriage or ectopic pregnancy, ovulation can return quickly and before the next period. Most methods can start immediately: pills, implant and injection on the day; IUD after surgical abortion or once completion of a medical abortion or miscarriage is confirmed according to the clinical pathway. A method started within five days of pregnancy ending is generally immediately effective; later starts require method-specific precautions. Fertility is not harmed by prompt contraception, and removal or stopping restores the method’s usual fertility profile.
Emergency contraception timing changes after pregnancy. It is unnecessary before day 21 postpartum because ovulation is not expected, but becomes relevant from day 21 unless all lactational-amenorrhoea criteria are met: under six months postpartum, amenorrhoeic, and fully or nearly fully breastfeeding without long gaps. A copper IUD can be used for EC from day 28 postpartum. After abortion or pregnancy loss, consider EC from day 5 because ovulation can resume early.
Perimenopause reduces but does not abolish fertility. Review vascular risk, bleeding, bone health, symptoms and medicine use rather than denying contraception by age. A medically eligible nonsmoker may use CHC until 50, when a safer alternative is recommended. POP and implant can generally continue to 55 with licensed replacements as needed. DMPA should usually be reviewed and changed around 50. A copper IUD inserted from age 40 and a 52 mg LNG-IUD inserted from age 45 may have extended contraceptive use to menopause or age 55 under current guidance.
Stopping depends on whether hormones obscure bleeding. Without hormonal contraception, use two years after the final natural period if under 50 and one year if 50 or older. At 55 contraception can usually stop. For an amenorrhoeic person over 50 using POP, implant or LNG-IUD who wants to stop earlier, an FSH above 30 IU/L can support continuing contraception for one further year before stopping under guidance. Do not use FSH while taking CHC or HRT because exogenous hormones make it uninterpretable. HRT doses do not suppress ovulation reliably and are not contraception.
A 52 mg LNG-IUD can serve both as contraception and the progestogen component of systemic oestrogen HRT, but its replacement interval for endometrial protection is shorter than extended contraceptive use. Record the indication and date. Investigate new heavy, persistent irregular, postcoital or postmenopausal bleeding according to cancer pathways; neither age nor a hormonal method makes unexplained bleeding benign.
Key points
- Discuss postpartum contraception antenatally and provide the chosen method before discharge where possible; fertility intention and consent must be revisited after birth rather than assumed.
- The implant and POP can start immediately after childbirth. DMPA can also be provided postpartum when medically eligible, with bleeding, bone and fertility-return counselling.
- Insert a copper or levonorgestrel IUD within 48 hours of birth, including at caesarean, or wait until at least four weeks postpartum if that immediate window is missed.
- Before three weeks postpartum, CHC is UKMEC 4 with additional VTE factors and 3 without them; breastfeeding makes CHC category 4 until six weeks. From three to six weeks, apply the current category rather than a calendar rule alone.
- All contraceptive methods can generally be started immediately after abortion or pregnancy loss when clinically appropriate; immediate provision prevents loss to follow-up and does not impair future fertility.
- Emergency contraception is considered from day 21 after birth unless strict lactational-amenorrhoea criteria apply, and from day 5 after abortion, miscarriage, ectopic treatment or uterine evacuation.
- In perimenopause, HRT is not contraception. Eligible nonsmokers may use CHC until age 50; POP, implant and suitable intrauterine methods can continue longer under method-specific rules.
- Without hormonal contraception, stop after two years of amenorrhoea if under 50, one year if 50 or older, or at age 55 when spontaneous conception is exceptionally rare.
02Assessment and patient selectionRisk features, eligibility and important cautions.
The first weeks after birth carry high thrombotic risk, amplified by haemorrhage, caesarean, immobility, obesity, smoking and pre-eclampsia.
Pregnancy can occur before the first postpartum or post-abortion period, so amenorrhoea alone does not prove absence of fertility.
Protection requires all three conditions: less than six months postpartum, no return of periods and fully or nearly fully breastfeeding.
CHC, POP, implant, injection, LNG-IUD and HRT can alter bleeding, making amenorrhoea an unreliable marker of ovarian cessation.
Persistent intermenstrual, postcoital, postmenopausal or markedly heavy bleeding needs assessment even when cycle irregularity is expected in perimenopause.
03Baseline assessmentMeasurements that guide the plan and track progress.
Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.
- 01
Pregnancy and intercourse chronologyFirst step - Why
- Determine immediate initiation, emergency contraception and repeat-testing requirements after pregnancy.
- Interpretation and limitations
- Use birth or pregnancy-end date and all subsequent intercourse. EC becomes relevant from postpartum day 21 or day 5 after pregnancy ends.
- 02
Postpartum VTE assessment - Why
- Determine whether and when oestrogen-containing contraception can be used safely.
- Interpretation and limitations
- Combine postpartum day, breastfeeding, mode of birth, haemorrhage, transfusion, immobility, BMI, smoking, pre-eclampsia and thrombotic history under UKMEC.
- 03
Confirmation of pregnancy completion - Why
- Establish when intrauterine contraception can be placed after medical abortion or miscarriage.
- Interpretation and limitations
- Use the abortion or early-pregnancy service protocol, symptoms, examination, hCG or ultrasound as indicated; a continuing or ectopic pregnancy changes management.
- 04
Selective serum FSH - Why
- Support stopping advice in an amenorrhoeic person over 50 using selected progestogen-only contraception.
- Interpretation and limitations
- An FSH above 30 IU/L supports one further year of contraception before stopping. Do not interpret FSH during CHC or HRT use.
- 05
Abnormal-bleeding assessment - Why
- Exclude pregnancy, cervical, endometrial or structural disease when bleeding is not an expected transient pattern.
- Interpretation and limitations
- Postmenopausal bleeding uses urgent cancer exclusion; intermenstrual or postcoital bleeding and treatment failure direct examination, imaging, hysteroscopy or referral.
04InterventionsLifestyle, treatment and escalation options.
01Postpartum first lineProvide before fertility returnsFirst stepFirst lineContraception is requested antenatally or after childbirth.+
- 1Reconfirm reproductive intention and medical eligibility after birth, including breastfeeding, VTE factors, bleeding and whether the patient still wants the antenatal choice.
- 2Offer immediate POP, implant or eligible DMPA, or intrauterine placement within 48 hours; if that IUD window is missed, arrange insertion from four weeks.
- 3Delay CHC for at least 21 days and longer when breastfeeding or thrombosis factors require it, using an effective bridge and exact start precautions.
02Post-abortion first lineStart at completionFirst lineAn abortion, miscarriage or ectopic pregnancy has been managed and contraception is wanted.+
- 1Offer all suitable methods before discharge and verify completion when intrauterine insertion follows a medical process.
- 2Start pills, implant or injection immediately and insert an IUD at surgical treatment or after completion according to the service pathway.
- 3If initiation occurs more than five days after pregnancy ends, apply method-specific backup and assess intercourse from day 5 for emergency contraception.
03PerimenopauseSeparate contraception from HRTA patient over 40 has changing cycles, menopausal symptoms or wants to stop contraception.+
- 1Review bleeding red flags, smoking, blood pressure, vascular and bone risks, symptoms, current method and whether systemic HRT is used.
- 2Continue or switch contraception using age-specific guidance: change from CHC and generally DMPA at 50, while suitable POP, implant and IUD options can continue longer.
- 3Apply natural-amenorrhoea, selective FSH or age-55 stopping rules and maintain separate endometrial-protection replacement dates when an LNG-IUD supports HRT.
04Unexpected exposureUse the post-pregnancy EC clockUnprotected intercourse occurs before ongoing contraception is effective.+
- 1Calculate time from childbirth or pregnancy end and confirm whether strict lactational-amenorrhoea criteria are all present.
- 2Offer EC from postpartum day 21 or day 5 after pregnancy ends, with copper-IUD EC available from postpartum day 28 when eligible.
- 3Start ongoing contraception with oral-EC-specific timing, give backup and test 21 days after the latest unprotected intercourse.
05Medicines and treatment safetyRegimens, contraindications and review points.
Desogestrel 75 microgram progestogen-only pill postpartum
Take one tablet orally at the same time every day without a hormone-free interval; it may be started immediately after childbirth with start and missed-pill precautions given for the exact timing.Check breast and liver eligibility, enzyme-inducing medicines, irregular bleeding and product-specific missed-pill rules; it does not protect against STIs.
Levonorgestrel 52 mg intrauterine device for contraception and HRT
Insert one 52 mg device at a valid postpartum or interval time; document separate replacement dates when it provides contraception and when it supplies endometrial protection with systemic oestrogen HRT.Immediate postpartum insertion has higher expulsion risk; assess pregnancy, infection, cavity and breast eligibility and never extend the HRT-protection interval from the longer contraceptive duration.
06Targets, monitoring and follow-upResponse, safety and longer-term review.
- Confirm that the planned postpartum or post-abortion method was actually provided and that any interval insertion appointment did not become an unprotected gap.
- Review bleeding, pain, fever, discharge and pregnancy symptoms after pregnancy ends, escalating possible haemorrhage, infection, retained tissue or ectopic pregnancy.
- Reassess CHC eligibility when postpartum timing, breastfeeding or VTE factors change and use a documented safe bridge until oestrogen becomes acceptable.
- From age 40, review blood pressure, smoking, vascular and bone risks, bleeding pattern, HRT use and current replacement dates rather than continuing unchanged by inertia.
- Track both contraceptive and HRT endometrial-protection indications for an LNG-IUD and replace at the earlier date required by the active indication.
07Special situationsVariants, exceptions and circumstances that change the usual approach.
The discharge window matters
Providing a chosen method before leaving maternity or abortion care prevents a predictable access gap during rapid fertility return.
The IUD has two postpartum windows
Insertion is undertaken within 48 hours or from four weeks; remembering only interval insertion misses an effective immediate option.
Breastfeeding is not automatically contraception
Only the complete lactational-amenorrhoea criteria provide short-term protection, and any missing criterion restores pregnancy risk.
HRT is symptom treatment
Its hormone doses are not designed to prevent ovulation, so a separate contraceptive method remains necessary until stopping criteria are met.
One device can have two clocks
A 52 mg LNG-IUD may remain effective for contraception after its approved HRT endometrial-protection interval has ended.
08Common pitfallsFrequent interpretation and management errors.
- 01
Deferring all contraception until the six-week postnatal check despite immediate progestogen-only and postpartum-IUD options.
- 02
Starting CHC within 21 days of birth or ignoring breastfeeding and VTE factors between days 21 and 42.
- 03
Assuming amenorrhoea proves contraception after birth without confirming all lactational-amenorrhoea criteria.
- 04
Forgetting that emergency contraception may be needed from day 5 after abortion or pregnancy loss.
- 05
Using HRT as contraception or using FSH to diagnose menopause during CHC or HRT use.
- 06
Extending an LNG-IUD’s HRT-protection interval because its contraceptive licence is longer.