You can take Plan B immediately after an abortion. The American College of Obstetricians and Gynecologists confirms that all contraceptive methods, including emergency contraception, are safe and effective when provided right after an abortion procedure. There is no required waiting period for either surgical or medical abortion.
Why Timing Matters So Much
Fertility returns surprisingly fast after an abortion. After a surgical abortion performed before 12 weeks, ovulation can resume in as few as 6 to 21 days. After a medical abortion using mifepristone and misoprostol, ovulation returns in an average of about 21 days, though it can happen as early as 8 days after taking mifepristone. That means pregnancy is possible within just a couple of weeks, even before your next period arrives.
Plan B works by preventing or delaying ovulation. It’s most effective within 72 hours of unprotected sex, though it retains some effectiveness up to 120 hours (5 days). It’s roughly 85 percent effective at preventing pregnancy, and that number drops the longer you wait. If you’ve had unprotected sex after your abortion, take it as soon as possible.
After a Medical Abortion
Medical abortion involves two medications taken in sequence: mifepristone followed by misoprostol. ACOG guidelines, reaffirmed in 2024, state that most contraceptive methods can be offered at the time of mifepristone administration. Emergency contraception like Plan B falls into this category and can be started at the same visit without interfering with the abortion’s effectiveness.
One small caveat worth knowing: a large study found that patients who started certain hormonal contraception on the day of mifepristone had a slightly higher rate of ongoing pregnancy compared to those who started at a follow-up confirmation visit. However, the overall rates of ongoing pregnancy remained very low, and there was no increased need for additional procedures. For Plan B specifically, which is a single dose rather than an ongoing method, the concern is minimal.
After a Surgical Abortion
After an in-clinic (aspiration or suction) procedure, contraception can begin the same day. Hormonal methods, implants, IUDs, and emergency contraception are all considered effective immediately. If you had a surgical abortion and then had unprotected sex in the days or weeks following, Plan B is a straightforward option with no special timing restrictions beyond the standard 72-hour window from the unprotected encounter.
Other Emergency Contraception Options
Plan B isn’t the only choice. A copper IUD is the most effective form of emergency contraception and can be placed up to five days after unprotected sex. It also provides ongoing protection for years afterward. Another pill option, sold under the brand name Ella, uses a different active ingredient and maintains its effectiveness across the full five-day window better than Plan B does. Both are safe to use after an abortion.
Sorting Out Symptoms
Taking Plan B during abortion recovery can make it harder to tell which symptoms are coming from which source. After a medical abortion, you can expect fatigue, cramping, and bleeding or spotting as part of normal recovery. Plan B can cause its own set of effects: headaches, dizziness, breast tenderness, and nausea. It can also shift the timing and heaviness of your next period, which is already unpredictable after an abortion.
None of these overlapping symptoms are dangerous on their own, but they can make it confusing to track your recovery. Heavy bleeding that soaks through more than two thick pads per hour for two or more hours is not a normal side effect of either and warrants medical attention.
When to Test for Pregnancy
After an abortion, pregnancy hormones linger in your body for weeks, which means a standard pregnancy test can show a false positive even when the abortion was completely successful. Wait at least three weeks after your abortion before testing. If the result is still positive at that point, retest two weeks later. This timeline applies whether or not you took Plan B. Taking emergency contraception doesn’t change how long pregnancy hormones take to clear your system, but it does add another variable that can make your cycle harder to read in the short term.
If you’re looking for ongoing protection rather than emergency options, starting a regular contraceptive method right after your abortion is the most reliable approach. Most methods, from pills to implants to IUDs, can be initiated the same day as your procedure or at your follow-up visit.