Can You Get Your Period It Stops Then Get It Again on Plan B
Common mistakes that make Plan B less constructive and what you tin can do nigh it
This article was medically reviewed by Lauren Demosthenes, MD, OB-GYN, senior medical managing director at Babyscripts.
- Plan B is 95% constructive if y'all take information technology within 24 hours and 89% effective within 72 hours.
- But it might be less constructive if you are ovulating, or accept unprotected sex afterward taking Program B.
- It is besides less effective for women over 155 pounds — if this is the case, try a pill like Ella.
- Visit Insider's Health Reference library for more communication.
Plan B has a 95% chance of preventing pregnancy if you accept it within 24 hours. If you lot take it within 72 hours, your chances reduce to 89%.
"Plan B is FDA approved for use upwardly to 72 hours afterward unprotected sex. It tin can exist used up to 120 hours after, but the farther out from intercourse, the less effective it will become," Nicole Thou. Bender, MD, an OB-GYN at Keck School of Medicine of USC.
So, for max protection, take the pill as speedily as you can become it.
How Plan B works
The agile ingredient in Plan B that prevents pregnancy is a hormone called levonorgestrel, which is a constructed version of progesterone.
Aileen Gariepy, Dr., OB-GYN at Yale Medicine and associate professor at Yale Schoolhouse of Medicine says that levonorgestrel works to prevent pregnancy by:
- Delaying or stopping ovulation, which is when an egg gets released from the ovary.
- Preventing fertilization by slowing downwards the path of the egg or sperm so that they don't meet.
- Stopping a fertilized egg from implanting in the uterus by thinning the uterine lining.
Plan B won't work if a pregnancy has already been established, says Gariepy. The just mode to know for sure if y'all're pregnant is to have a pregnancy test. However, you can also look out for early pregnancy symptoms like a missed menses, nausea, vomiting, or sore breasts.
Additionally, if y'all've ovulated recently, some research indicates that Plan B does non work besides.
Ovulation typically occurs right in the middle of your menstrual cycle, such as on day 14 if you have a 28 day cycle. Yous might also notice clear and stretchy vaginal discharge. To be extra sure, you can purchase over-the-counter ovulation strips to make up one's mind if you're ovulating.
How long is Program B constructive
Plan B starts working presently after taking the pill. Peak levels of Program B in your bloodstream volition occur about 1.7 hours afterwards taking the pill.
Depending on where you are in your cycle, Plan B will likely filibuster ovulation for a few days, says Gariepy. And the levonorgestrel should exit your organization after about a week or and then, depending on how fast your metabolism is, Gariepy says.
Still, it's important to notation that program B just works for the episode of unprotected sexual activity you have already had. If you have unprotected sex before long after taking plan B — like later that day or the post-obit day — then yous will need to take another dose of plan B to prevent pregnancy.
Side effects of Plan B
Plan B may cause side effects, which Gariepy says are most likely to occur inside a few hours of taking the pill, since the peak levels in your blood will be around one.7 hours afterwards. Side effects will usually resolve inside 24 hours and include:
- Nausea
- Airsickness
- Headache
- Dizziness
- Chest tenderness
- Vaginal bleeding
four things that make Programme B less effective
Be aware that in that location is a hazard Program B might not work for you if yous fall into ane of the post-obit groups.
- People who throw upwardly before long after taking the pill: Yous need about 2 hours to absorb the levonorgestrel, so if you throw upwardly within two hours after taking plan B, accept another dose to make sure information technology enters your arrangement.
- People who are already ovulating: If you accept already ovulated (an egg has already been released), Plan B may not be as constructive in preventing pregnancy, Gariepy says.
- People who have unprotected sex correct later taking Plan B: "If Plan B delays ovulation by a few days and then you have some other deed of unprotected sex a few days later, you can still get significant," Bender says. So, if you want to be prophylactic, be sure to utilize protection the next time you accept sex activity.
- People in a higher place a sure weight: If you take a torso mass index (BMI) of 26 or higher, Plan B may be less constructive, says Bender. A 2022 study found that every bit someone's torso weight went upward, the effectiveness of levonorgestrel went downwardly. In fact, the researchers reported that women who weighed 187 pounds, or more, were equally at risk of getting pregnant after unprotected sex whether they used programme B, or not. A prescription emergency contraception called Ella, is more than effective in women who weigh 155 pounds or more. Ella can be used upwardly to 120 hours after unprotected sex, though it's more effective the sooner you take it.
Insider's takeaway
Program B is a type of emergency contraception that is very effective at preventing pregnancy if you take it within 24 hours of unprotected sex. The longer yous wait to take it, the less effective it becomes.
Plan B is not a substitute for birth command . Information technology'southward meant for emergencies, not to be taken regularly. "Plan B is a corking back-up plan — pregnant it's not meant to be someone's starting time line of defence force against pregnancy," says Gariepy.
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Source: https://www.insider.com/how-effective-is-plan-b
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