Some medications may interact with Plan B, making it less effective, since they can decrease the amount of levonorgestrel in the blood. Medicines you should not take with plan B Ella can be used up to 120 hours after unprotected sex, though it's more effective the sooner you take it. Note: A prescription emergency contraception called Ella, is more effective in women who weigh 155 pounds or more. A prescription emergency contraception called Ella, is more effective in women who weigh 155 pounds or more. 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 plan B, or not. ![]() A 2015 study found that as someone's body weight went up, the effectiveness of levonorgestrel went down. 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.So, if you want to be safe, be sure to use protection the next time you have sex. People who have unprotected sex right after taking Plan B: "If Plan B delays ovulation by a few days and then you have another act of unprotected sex a few days later, you can still get pregnant," Bender says.People who are already ovulating: If you have already ovulated (an egg has already been released), Plan B may not be as effective in preventing pregnancy, Gariepy says.People who throw up shortly after taking the pill: You need about 2 hours to absorb the levonorgestrel, so if you throw up within two hours after taking plan B, take another dose to make sure it enters your system.Note: Plan B is different from an abortion pill, and it will not terminate an existing pregnancy.īe aware that there is a risk Plan B might not work for you if you fall into one of the following groups. To be extra sure, you can purchase over-the-counter ovulation strips to determine if you're ovulating. You might also notice clear and stretchy vaginal discharge. Ovulation typically occurs right in the middle of your menstrual cycle, such as on day 14 if you have a 28 day cycle. Note: Taking more than one dose of Plan B after an act of unprotected sex will not make it more effective, Gariepy says.Īdditionally, if you've ovulated recently, some research indicates that Plan B does not work as well. However, you can also look out for early pregnancy symptoms like a missed period, nausea, vomiting, or sore breasts. The only way to know for sure if you're pregnant is to take a pregnancy test. Plan B won't work if a pregnancy has already been established, says Gariepy. ![]() ![]()
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