You can usually start a progestin-only birth control pill right after giving birth, even if you are breastfeeding. Pills that contain both estrogen and progestin need more caution: avoid them during the first 3 weeks after delivery because blood-clot risk is higher. Breastfeeding and personal clot-risk factors may mean waiting until at least 6 weeks. Ask your clinician which pill and start date are safest for you.
When can you start each type of birth control pill?
The timing depends mainly on the hormones in your pill, whether you are breastfeeding, and your medical history. Birth control pills fall into two main groups: progestin-only pills and combined pills. Both can prevent pregnancy when used correctly, but they have different recommendations during the weeks after childbirth.
Progestin-only pills: Can you start immediately after delivery?
Yes. Progestin-only pills, sometimes called mini-pills, contain no estrogen and can generally be started immediately after childbirth. They are an option for people who are breastfeeding as well as those who are not. The Centers for Disease Control and Prevention (CDC) states that these pills may be started immediately postpartum, provided the healthcare professional can be reasonably certain that the person is not pregnant.
You do not usually need to wait for your first period to begin a progestin-only pill. However, the type of pill matters when deciding whether you need condoms or another temporary contraceptive method after starting it. These pills also need to be taken consistently, with the permitted delay depending on the formulation.
Combined birth control pills: How long should you wait?
Combined oral contraceptive pills contain both estrogen and progestin. They require more caution after childbirth because the risk of a blood clot is already higher during the postpartum period, particularly in the first 3 weeks.
According to the CDC guidance on combined hormonal contraceptives, these pills should not be used during the first 21 days after delivery, whether or not you are breastfeeding. After day 21, the appropriate start date depends on breastfeeding status and additional blood-clot risk factors.
If you are not breastfeeding and have no additional blood-clot risk factors, a clinician may approve a combined pill from day 21 after delivery. If you have other clot-risk factors, starting during the first 6 weeks may be unsuitable. After 42 days, combined pills are generally an option for people who are not breastfeeding, provided there are no other medical reasons to avoid them.
Does breastfeeding change when you can start the pill?
Yes. If you are breastfeeding, a progestin-only pill can generally be started immediately after delivery. Combined pills contain estrogen, so their timing requires additional consideration during early breastfeeding.
The UK National Health Service (NHS) guidance on contraception after birth advises people who are breastfeeding to wait until at least 6 weeks after delivery before starting a combined pill. This is a practical guideline, while the CDC provides more detailed recommendations based on the number of days since delivery and individual clot risk.
Under CDC guidance, combined pills should not be used during the first 21 days postpartum. They are generally not recommended between days 21 and 29. From days 30 through 42, some breastfeeding individuals without additional blood-clot risk factors may be eligible, while others should avoid them. After day 42, combined pills are generally considered an option for breastfeeding individuals, although personal circumstances still matter.
If maintaining your milk supply is a concern, discuss the options with your healthcare professional before choosing an estrogen-containing pill. A progestin-only pill is often a practical early postpartum choice because it can be started straight away and is suitable for breastfeeding for most people.
Why is the first 6 weeks after childbirth important?
Pregnancy and childbirth temporarily increase the risk of venous thromboembolism (VTE), which means a blood clot forming in a vein. Estrogen-containing contraception can add to this risk. The risk is highest during the first 3 weeks after delivery and decreases over the following weeks, approaching the usual baseline by about 42 days postpartum.
The CDC's 2024 U.S. Medical Eligibility Criteria for Contraceptive Use identifies several factors that may affect whether combined hormonal contraception is appropriate during this period, including:
- A personal history of blood clots or a known blood-clotting disorder.
- Limited mobility or prolonged immobility.
- A cesarean birth, postpartum hemorrhage, or a blood transfusion around delivery.
- Preeclampsia or certain heart conditions associated with pregnancy.
- Obesity, particularly when other clot-risk factors are also present.
- Smoking, especially in people aged 35 years or older.
- Other medical factors that increase the likelihood of blood clots.
These factors do not automatically rule out every birth control pill. They help a clinician decide which formulation is appropriate and when it can be started. Combined pills may also be unsuitable for people with a history of stroke, certain types of migraine, or uncontrolled high blood pressure, so a review of your medical history is important.
When does a postpartum birth control pill start working?
Starting a pill and being protected against pregnancy are not always the same thing. Depending on the pill and when you begin taking it, you may need to use condoms or avoid sex for a short period until the contraceptive takes effect. Follow the instructions for your specific formulation rather than assuming that all pills work on the same schedule.
For combined pills started postpartum when the person is eligible to use them, the CDC generally recommends condoms or another temporary contraceptive method for the first 7 days if the first menstrual period has not returned. If menstrual bleeding has returned, the timing of the start in relation to the period also affects whether backup contraception is needed.
For progestin-only pills, the backup period depends on the formulation. The NHS guidance on taking the progestogen-only pill explains that traditional and desogestrel pills generally require 2 days of additional protection when started 21 days or more after delivery, while drospirenone pills generally require 7 days. Recommendations may differ by country and product, so check the instructions supplied with your pill or ask a pharmacist or clinician.
Do you need to wait until your period returns?
No. You generally do not need to wait for your first postpartum period before starting an appropriate birth control pill. Ovulation, which is the release of an egg, can occur before the first menstrual period. This means pregnancy is possible even if your periods have not returned.
The NHS guidance on contraception after childbirth notes that pregnancy can occur as early as 3 weeks after birth, including when you are breastfeeding and have not had a period. It is therefore sensible to choose a suitable contraceptive method before resuming sex that could lead to pregnancy.
Breastfeeding can delay the return of fertility, but it does not reliably prevent pregnancy in every situation. The lactational amenorrhea method (LAM) is a temporary contraceptive approach that depends on specific conditions, including the baby being under 6 months old, no return of menstrual bleeding, and exclusive or nearly exclusive breastfeeding. If any of these conditions are not met, another contraceptive method may be needed.
How should you choose your postpartum pill?
Discuss your preferred pill during pregnancy, before leaving the hospital, or at your postpartum appointment. A clinician can help you select a method that fits your feeding plans, medical history, and preferences. You do not necessarily need to wait for a routine postpartum check to discuss contraception.
Before starting a combined pill, tell your healthcare professional if you have had blood clots, high blood pressure, migraine with aura, or other relevant medical conditions. Also mention smoking, particularly if you are aged 35 or older. The NHS guidance on who can take the combined pill explains that these factors can affect whether an estrogen-containing pill is suitable.
If you have recently given birth and need contraception immediately, a progestin-only pill may be an option while you consider your longer-term preferences. If you have already had sex without contraception and are concerned about pregnancy, contact a healthcare professional promptly to discuss whether emergency contraception or pregnancy testing is appropriate for your circumstances.
The key point is that you can generally start a progestin-only pill straight after childbirth, while a combined pill usually requires waiting at least 3 weeks and often 6 weeks when breastfeeding. Your exact start date should take account of postpartum blood-clot risk, breastfeeding, the pill formulation, and your medical history.