Can I Have Sex Again Within 24 Hours of Taking Plan B
Common mistakes that brand Programme B less effective and what you can do nearly it
This article was medically reviewed by Lauren Demosthenes, Md, OB-GYN, senior medical director at Babyscripts.
- Plan B is 95% effective if you have it inside 24 hours and 89% effective within 72 hours.
- Merely it might be less constructive if you are ovulating, or have unprotected sex later on taking Program B.
- It is too less effective for women over 155 pounds — if this is the instance, endeavour a pill like Ella.
- Visit Insider'due south Health Reference library for more advice.
Plan B has a 95% chance of preventing pregnancy if y'all take it inside 24 hours. If you accept it within 72 hours, your chances reduce to 89%.
"Program B is FDA approved for use upwards to 72 hours afterwards unprotected sex. Information technology tin can be used upwards to 120 hours after, only the further out from intercourse, the less constructive it will become," Nicole M. Bender, Doctor, an OB-GYN at Keck School of Medicine of USC.
So, for max protection, accept the pill as apace as you lot tin get it.
How Plan B works
The agile ingredient in Plan B that prevents pregnancy is a hormone called levonorgestrel, which is a synthetic version of progesterone.
Aileen Gariepy, MD, OB-GYN at Yale Medicine and associate professor at Yale School of Medicine says that levonorgestrel works to preclude pregnancy by:
- Delaying or stopping ovulation, which is when an egg gets released from the ovary.
- Preventing fertilization by slowing downwardly the path of the egg or sperm so that they don't come across.
- Stopping a fertilized egg from implanting in the uterus by thinning the uterine lining.
Plan B won't piece of work if a pregnancy has already been established, says Gariepy. The only way to know for certain if you're pregnant is to take a pregnancy examination. Nevertheless, you can likewise await out for early pregnancy symptoms like a missed flow, nausea, airsickness, or sore breasts.
Additionally, if y'all've ovulated recently, some research indicates that Program B does not work besides.
Ovulation typically occurs correct in the middle of your menstrual cycle, such as on solar day 14 if you lot have a 28 day bicycle. You might besides notice clear and stretchy vaginal belch. To be extra certain, you lot can purchase over-the-counter ovulation strips to determine if you lot're ovulating.
How long is Plan B effective
Program B starts working soon later taking the pill. Top levels of Plan B in your bloodstream volition occur about ane.7 hours after taking the pill.
Depending on where you are in your wheel, Plan B will probable delay ovulation for a few days, says Gariepy. And the levonorgestrel should go out your organisation after about a week or so, depending on how fast your metabolism is, Gariepy says.
Notwithstanding, it'south important to note that programme B only works for the episode of unprotected sex you have already had. If yous take unprotected sexual practice presently after taking plan B — like afterwards that day or the post-obit day — then y'all will need to take another dose of plan B to prevent pregnancy.
Side effects of Programme B
Plan B may cause side effects, which Gariepy says are almost probable to occur inside a few hours of taking the pill, since the peak levels in your claret will be around one.7 hours after. Side furnishings will usually resolve within 24 hours and include:
- Nausea
- Vomiting
- Headache
- Dizziness
- Breast tenderness
- Vaginal bleeding
4 things that brand Program B less effective
Exist aware that there is a adventure Plan B might not piece of work for you if yous fall into i of the following groups.
- People who throw up shortly later taking the pill: Y'all need about 2 hours to blot the levonorgestrel, so if y'all throw upwards inside 2 hours after taking programme B, have another dose to brand sure it enters your system.
- People who are already ovulating: If yous have already ovulated (an egg has already been released), Programme B may non be equally constructive in preventing pregnancy, Gariepy says.
- People who have unprotected sex right subsequently taking Plan B: "If Programme B delays ovulation by a few days and then you have another human activity of unprotected sex activity a few days later, you can notwithstanding get pregnant," Bender says. So, if you want to be safe, be sure to use protection the next time you have sex.
- People above a certain weight: If you have a body mass index (BMI) of 26 or higher, Plan B may be less effective, says Bender. A 2022 written report found that as someone'south body weight went up, the effectiveness of levonorgestrel went down. In fact, the researchers reported that women who weighed 187 pounds, or more, were equally at risk of getting pregnant later unprotected sex whether they used plan 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 upwards to 120 hours subsequently unprotected sexual practice, though information technology'southward more constructive the sooner you take it.
Insider'due south takeaway
Plan B is a type of emergency contraception that is very constructive at preventing pregnancy if you accept it within 24 hours of unprotected sexual practice. The longer you await to take it, the less effective it becomes.
Program B is not a substitute for birth control . It's meant for emergencies, not to exist taken regularly. "Plan B is a not bad back-up plan — meaning it'south not meant to exist someone's offset line of defense against pregnancy," says Gariepy.
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Source: https://www.insider.com/how-effective-is-plan-b
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