Donor Nexus
May 4, 2026
Many IVF patients are surprised when the first prescription on their treatment calendar is a pack of birth control pills. It can feel backward to take contraception when the goal is a pregnancy, yet fertility clinics use the pill before IVF all the time.
If you are about to start a cycle, with your own eggs or with donor eggs, this guide explains why your doctor may prescribe birth control, when you usually start it, how long you take it, and what current research says about its effect on success rates.
The short answer
Birth control before IVF is mainly a scheduling tool. It lets your clinic time the start of stimulation, lowers the chance of a new ovarian cyst, and in fresh donor egg cycles lines up the donor's cycle with yours.
Courses of about two to four weeks are common, followed by a short break of several days before injections begin. It is not required for every patient.
Why do you take birth control before IVF treatment?
The main reason is timing. An IVF cycle is built around the first days of a period, and natural cycles do not always arrive on schedule. The American Society for Reproductive Medicine (ASRM) states that hormonal contraception "can be considered to aid in the timing of assisted reproductive technology cycles, reduce the risk of ovarian cysts at in vitro fertilization cycle initiation," and improve the view before a hysteroscopy.1
In practice, that means birth control can help you and your clinic with a few things:
- Scheduling. Your clinic can set retrieval dates around lab capacity, your work and travel. This matters a lot if you are flying in for treatment.
- A quieter starting point. The pill suppresses your own hormone signals, so your ovaries start stimulation from a calmer baseline.
- Fewer new cysts. ASRM notes the pill can protect against new ovarian cysts forming, although it should not be started to shrink a cyst that is already there.1
- Coordinating two people. In a fresh donor egg cycle, the egg donor and the recipient both need to be on the same calendar.
When do you start birth control for an IVF cycle?
Most clinics have you start the pill in the first few days of your period, often after a baseline ultrasound or blood test confirms that your ovaries are quiet. Starting early in the cycle, before a lead follicle develops, is what lets the pill quiet your ovaries for the weeks ahead.
Your clinic will give you a written calendar. Keep it somewhere you can see it, set a daily alarm, and call your nurse if you miss a pill, because a missed dose can shift the rest of your dates.
How long are you on birth control before IVF starts?
Most people take the pill for about two to four weeks, although the exact number of days depends on your protocol and your clinic's schedule. ASRM cites a retrospective analysis that found 12 to 30 days of hormonal contraception followed by a 5-day washout did not affect clinical pregnancy, live birth or cumulative live birth rates.1 Europe's professional society, ESHRE, says a washout of at least 5 days may be used when the pill programs a cycle that ends in a fresh embryo transfer.2
Here is how birth control usually fits into a standard IVF calendar. Your own dates may differ.
| Step | Typical timing | What happens |
|---|---|---|
| Baseline check | First days of your period | Ultrasound and bloodwork, then you start the pill |
| Birth control pills | About 2 to 4 weeks | One pill daily to suppress your natural cycle and set the start date |
| Washout | About 5 days after the last pill | A withdrawal bleed while hormones settle |
| Ovarian stimulation | Often about 10 to 12 days | Daily injections with monitoring every few days |
| Trigger shot and retrieval | Retrieval 32 to 36 hours after the trigger | Eggs are collected under anesthesia |
Does birth control before IVF affect success rates?
Research is mixed, and the answer depends on the stimulation protocol. A 2017 Cochrane review found that in GnRH antagonist cycles, pill pretreatment was linked to a lower rate of live birth or ongoing pregnancy compared with no pretreatment (odds ratio 0.74, based on 6 randomized trials and 1,335 women).3 ESHRE's 2025 guideline update does not recommend pill pretreatment in antagonist protocols stimulated with FSH alone, because of reduced efficacy.2
ASRM takes a practical view. Its 2024 committee opinion concludes that hormonal contraception can be used for scheduling, notes inconsistent data on its effect on stimulation, and says it may increase the amount of gonadotropins required.1 Older claims that the pill helps you produce more eggs are not well supported.
Two more points are useful to know:
- AMH testing. ASRM notes long-term hormonal contraception can falsely lower markers of ovarian reserve such as AMH, so your doctor may want to retest after you stop.1
- Your protocol matters. If your clinic uses the pill, it has usually weighed scheduling benefits against these findings. Ask how your protocol handles the washout.
Is birth control required for every IVF cycle?
No, birth control is common but optional for many patients. Some clinics simply wait for a natural period to begin stimulation, and ESHRE notes that estrogen or progesterone pretreatment can be used for scheduling instead.2
Your doctor may also avoid estrogen-containing pills if you have certain health conditions. The CDC's contraception guidelines list combined hormonal methods as an unacceptable health risk for people with, for example, migraine with aura, a history of stroke, known clotting mutations such as factor V Leiden, or smoking 15 or more cigarettes a day at age 35 or older.4 When combination pills are not a safe choice, ASRM notes that a progestin-only pill may be used as an alternative.1 Tell your doctor about any history of blood clots, migraines or high blood pressure before you start.
How does birth control work in a donor egg IVF cycle?
In a fresh donor egg cycle, birth control is often how two calendars become one. ASRM notes that hormonal contraception can be used "to coordinate the oocyte donor with the oocyte recipient," and also reduces the risk of a cycle being canceled because of an unintended pregnancy in the donor.1
| Fresh donor egg cycle | Frozen donor egg cycle | |
|---|---|---|
| Does the donor's cycle need to match yours? | Yes, retrieval and your embryo transfer plans are coordinated | No, the eggs were retrieved and frozen earlier |
| Who may take birth control | The egg donor, and often the recipient | Only the recipient, if your clinic uses it to time transfer preparation |
| Typical donor timing | Donors usually take birth control for 7 to 10 days before injections | Not applicable |
| Flexibility | Depends on the donor's cycle and your clinic | Eggs ship to your clinic and are warmed when you are ready |
With Fresh Donor Matching, one of our donor egg programs, your donor is matched only to you and cycles with your clinic, so both calendars are managed together. The Donor Nexus Frozen Egg Bank removes that step, because cohorts of 6 frozen eggs ship to your clinic worldwide through Cryoport. Our comparison of fresh vs frozen donor eggs covers timing, cost and egg numbers side by side.
If you are an egg donor reading this, the rules for your own cycle are a little different. Our guide to donating eggs while on birth control explains what applies to donors.
Is birth control used before a frozen embryo transfer?
Sometimes. Some clinics prescribe a short pill course to set the start date of a frozen embryo transfer (FET) cycle, especially when they are coordinating a busy lab calendar, while others start preparation with your natural period. Practice varies from clinic to clinic, and neither approach is right for everyone.
If your FET calendar includes birth control, ask your clinic why they chose it for you and when your lining check is scheduled. If you are still weighing the bigger decision about donor eggs, our article on whether to use donor eggs walks through the questions parents ask most.
Frequently asked questions
Why do you take birth control before IVF treatment?
Most clinics use it to schedule the start of ovarian stimulation, to lower the chance of a new ovarian cyst at the start of the cycle, and in donor egg cycles to line up the egg donor's timing with the recipient's. It does not act as a fertility treatment on its own.
How long are you on birth control before IVF starts?
It varies by clinic and protocol, but a course of about two to four weeks is common. ASRM notes that a retrospective analysis found 12 to 30 days of pills followed by a 5-day break did not affect pregnancy or live birth rates.
When do you start birth control for an IVF cycle?
Many clinics start the pill in the first few days of your period, after a baseline ultrasound or bloodwork. Follow the start day on your own calendar, since protocols differ.
Can you do IVF without birth control?
Yes. Some protocols start stimulation with a natural period, and others use estrogen or progesterone for timing instead. People who should not take estrogen may be offered a progestin-only option.
Do you take birth control before a frozen embryo transfer?
Some clinics use a short pill course to time the start of a frozen embryo transfer cycle, while others do not. Ask your clinic whether your transfer calendar includes it and why.
Sources
- Practice Committee of the American Society for Reproductive Medicine. The use of hormonal contraceptives in fertility treatments: a committee opinion (2024). Fertility and Sterility. 2024;122:243-250. asrm.org
- Ata B, Bosch E, Broer S, et al. ESHRE guideline: ovarian stimulation for IVF/ICSI: an update in 2025. Human Reproduction. 2026;41(4):498-514. pmc.ncbi.nlm.nih.gov
- Farquhar C, Rombauts L, Kremer JA, Lethaby A, Ayeleke RO. Oral contraceptive pill, progestogen or oestrogen pretreatment for ovarian stimulation protocols for women undergoing assisted reproductive techniques. Cochrane Database of Systematic Reviews. 2017;5:CD006109. pubmed.ncbi.nlm.nih.gov
- Centers for Disease Control and Prevention. Appendix D: Classifications for Combined Hormonal Contraceptives. U.S. Medical Eligibility Criteria for Contraceptive Use, 2024. cdc.gov
Medical disclaimer
This article is general information about IVF medications and is not medical advice. Follow the protocol your fertility clinic prescribes, and talk with your doctor before starting, stopping or changing any medication.
Keep reading
How to prepare for IVF with donor eggs
A personal guide to getting ready for a donor egg IVF cycle, from medications to emotional preparation.
Donor egg IVF success rates explained
What donor egg IVF success rates measure, how to read clinic data, and which numbers matter most for your family.
Why a backup plan matters in IVF
How parents use fresh and frozen donor egg options together so one setback does not end their plans.
Donor Nexus
Donor Nexus is an egg donation agency, frozen egg bank, and embryo donation program based in Newport Beach, California. Since 2012 it has worked with more than 150 fertility clinics in the United States and abr…
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