Took Plan B Then He Came in Me Again
Common mistakes that make Plan B less effective and what you tin can practice about it
This article was medically reviewed by Lauren Demosthenes, MD, OB-GYN, senior medical director at Babyscripts.
- Plan B is 95% constructive if you take information technology within 24 hours and 89% effective inside 72 hours.
- But information technology might be less constructive if you lot are ovulating, or have unprotected sexual practice later on taking Plan B.
- It is also less effective for women over 155 pounds — if this is the instance, try a pill similar Ella.
- Visit Insider'due south Health Reference library for more communication.
Programme B has a 95% gamble of preventing pregnancy if you take it inside 24 hours. If yous take it within 72 hours, your chances reduce to 89%.
"Program B is FDA approved for utilise up to 72 hours after unprotected sexual practice. It can be used up to 120 hours after, but the further out from intercourse, the less constructive it will become," Nicole M. Bough, Doctor, an OB-GYN at Keck School of Medicine of USC.
So, for max protection, take the pill as speedily as you tin go it.
How Program 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, MD, OB-GYN at Yale Medicine and associate professor at Yale Schoolhouse of Medicine says that levonorgestrel works to forestall 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 so that they don't meet.
- Stopping a fertilized egg from implanting in the uterus by thinning the uterine lining.
Programme B won't work if a pregnancy has already been established, says Gariepy. The just way to know for certain if you're meaning is to take a pregnancy test. However, you can besides look out for early pregnancy symptoms like a missed catamenia, nausea, vomiting, or sore breasts.
Additionally, if you've ovulated recently, some enquiry indicates that Plan B does non work likewise.
Ovulation typically occurs correct in the middle of your menstrual cycle, such as on day 14 if y'all accept a 28 solar day cycle. You might also notice articulate and stretchy vaginal discharge. To be extra sure, you tin can purchase over-the-counter ovulation strips to determine if y'all're ovulating.
How long is Plan B effective
Plan B starts working soon subsequently taking the pill. Height levels of Plan B in your bloodstream will occur about 1.vii hours after taking the pill.
Depending on where you are in your cycle, Plan B will likely delay ovulation for a few days, says Gariepy. And the levonorgestrel should exit your system afterward most a week or so, depending on how fast your metabolism is, Gariepy says.
However, it's important to notation that program B but works for the episode of unprotected sex you have already had. If y'all have unprotected sex activity shortly after taking plan B — like later that day or the following day — then you volition need to take another dose of plan B to forestall pregnancy.
Side effects of Plan B
Program B may cause side effects, which Gariepy says are most likely to occur within a few hours of taking the pill, since the acme levels in your claret volition be effectually one.vii hours after. Side furnishings will usually resolve within 24 hours and include:
- Nausea
- Airsickness
- Headache
- Dizziness
- Breast tenderness
- Vaginal bleeding
four things that make Plan B less constructive
Be enlightened that in that location is a risk Plan B might not work for you if you fall into one of the following groups.
- People who throw up soon afterwards taking the pill: You need about 2 hours to blot the levonorgestrel, so if yous throw up inside 2 hours later on taking plan B, take another dose to brand certain it enters your system.
- People who are already ovulating: If you lot have already ovulated (an egg has already been released), Plan B may not be every bit effective in preventing pregnancy, Gariepy says.
- People who have unprotected sex right after taking Plan B: "If Plan B delays ovulation by a few days and and so you have another act of unprotected sex a few days after, you lot can still get pregnant," Bender says. And then, if you desire to be safety, be certain to apply protection the side by side time you have sex.
- People in a higher place a sure weight: If yous have a body mass index (BMI) of 26 or higher, Programme B may be less effective, says Bender. A 2015 report plant that equally someone's body weight went upward, the effectiveness of levonorgestrel went down. In fact, the researchers reported that women who weighed 187 pounds, or more than, were equally at run a risk of getting pregnant after unprotected sex activity whether they used program B, or not. A prescription emergency contraception called Ella, is more effective in women who weigh 155 pounds or more. Ella can exist used upwardly to 120 hours later unprotected sex, though it'south more constructive the sooner you have it.
Insider's takeaway
Program B is a type of emergency contraception that is very effective at preventing pregnancy if you take information technology within 24 hours of unprotected sex. The longer you wait to take it, the less effective it becomes.
Programme B is not a substitute for nativity command . Information technology'southward meant for emergencies, not to be taken regularly. "Program B is a swell back-up program — meaning it's not meant to be someone's outset 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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