How Long Can U Wait to Take Plan B
Common mistakes that brand Programme B less effective and what you lot can do nearly it
This article was medically reviewed by Lauren Demosthenes, Doc, OB-GYN, senior medical manager at Babyscripts.
- Program B is 95% constructive if you take information technology inside 24 hours and 89% constructive within 72 hours.
- But information technology might be less effective if you are ovulating, or have unprotected sex activity after taking Plan B.
- It is as well less effective for women over 155 pounds — if this is the case, try a pill like Ella.
- Visit Insider'southward Health Reference library for more advice.
Plan B has a 95% chance of preventing pregnancy if you have it within 24 hours. If you take it inside 72 hours, your chances reduce to 89%.
"Program B is FDA approved for use upward to 72 hours after unprotected sexual activity. Information technology tin can be used upward to 120 hours after, only the further out from intercourse, the less effective information technology will get," Nicole One thousand. Bender, MD, an OB-GYN at Keck School of Medicine of USC.
So, for max protection, take the pill equally quickly every bit you can become it.
How Plan B works
The active ingredient in Programme 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 forbid pregnancy by:
- Delaying or stopping ovulation, which is when an egg gets released from the ovary.
- Preventing fertilization by slowing down the path of the egg or sperm and then that they don't meet.
- Stopping a fertilized egg from implanting in the uterus past thinning the uterine lining.
Plan B won't work if a pregnancy has already been established, says Gariepy. The only way to know for sure if you're pregnant is to take a pregnancy exam. Withal, y'all can also look out for early pregnancy symptoms like a missed period, nausea, vomiting, or sore breasts.
Additionally, if y'all've ovulated recently, some research indicates that Programme B does not work as well.
Ovulation typically occurs right in the heart of your menstrual bike, such every bit on 24-hour interval 14 if y'all have a 28 mean solar day cycle. Yous might also detect clear and stretchy vaginal discharge. To be actress sure, you tin can purchase over-the-counter ovulation strips to decide if you're ovulating.
How long is Plan B effective
Plan B starts working soon after taking the pill. Elevation levels of Plan B in your bloodstream will occur about i.7 hours after taking the pill.
Depending on where you lot are in your bike, Plan B will likely filibuster ovulation for a few days, says Gariepy. And the levonorgestrel should leave your organisation after about a week or so, depending on how fast your metabolism is, Gariepy says.
However, information technology'due south important to note that program B only works for the episode of unprotected sexual practice y'all have already had. If you have unprotected sex shortly after taking plan B — like later that day or the post-obit twenty-four hour period — then y'all volition need to take another dose of plan B to forestall pregnancy.
Side effects of Program B
Plan B may cause side effects, which Gariepy says are virtually likely to occur within a few hours of taking the pill, since the height levels in your claret will exist around 1.vii hours later. Side effects will normally resolve within 24 hours and include:
- Nausea
- Vomiting
- Headache
- Dizziness
- Breast tenderness
- Vaginal haemorrhage
four things that make Program B less effective
Be aware that there is a risk Plan B might non work for you if you fall into ane of the following groups.
- People who throw upwardly shortly after taking the pill: Y'all need well-nigh 2 hours to absorb the levonorgestrel, so if you throw up within two hours later on taking plan B, take another dose to make sure it enters your arrangement.
- People who are already ovulating: If you take already ovulated (an egg has already been released), Plan B may not exist as constructive in preventing pregnancy, Gariepy says.
- People who accept unprotected sex correct after taking Plan B: "If Program B delays ovulation by a few days and and so you have some other deed of unprotected sex a few days after, yous tin can still become pregnant," Bender says. And so, if you want to be rubber, be certain to employ protection the adjacent time you lot have sex.
- People to a higher place a certain weight: If you take a body mass index (BMI) of 26 or college, Plan B may exist less constructive, says Bough. A 2022 study found that as someone's trunk 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 hazard of getting pregnant subsequently 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 exist used up to 120 hours after unprotected sex, though it'due south more than effective the sooner you lot take information technology.
Insider'southward takeaway
Plan B is a type of emergency contraception that is very effective at preventing pregnancy if you accept information technology inside 24 hours of unprotected sexual activity. The longer yous wait to have information technology, the less effective it becomes.
Program B is non a substitute for nascence control . It's meant for emergencies, not to exist taken regularly. "Programme B is a cracking back-up plan — meaning it's not meant to be someone's first line of defence force confronting pregnancy," says Gariepy.
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Source: https://www.insider.com/how-effective-is-plan-b
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