How does plan b affect your period

These include anti-HIV drugs efavirenz and ritonavir , anticonvulsant drugs phenytoin, carbamazepine, primidone and phenobarbital , antibiotics ampicillin, cotrimoxazole, tetracycline, temafloxacin, and clarithromycin , rifampicin, rifabutin, griseofulvin, St. When did you have sex without a contraceptive or have a contraceptive accident? Select hour a. Other Effects In addition to affecting your menstrual cycle, the morning-after pill can cause a few mild side effects, including: Dizziness.

Breast pain. Abdominal pain. Download Nulled WordPress Themes. Download WordPress Themes Free. Health Conditions Discover Plan Connect. Rheumatoid Arthritis. Short answer Identifying menstruation Side effects vs. What will your first period look like? What makes this different from Plan B-related bleeding? How else can you tell if Plan B worked? Why does Plan B affect your period this way?

The bottom line. Read this next. How to Handle a Pregnancy Scare. Medically reviewed by Debra Sullivan, Ph. Medically reviewed by Fernando Mariz, MD. Medically reviewed by Janet Brito, Ph. That extra-strong dose of levonorgestrel a type of synthetic progesterone — aka progestin.

Though some hormonal birth control pills also contain levonorgestrel to prevent pregnancy , the morning after pill has it in much higher quantities.

This can do a number on your menstrual cycle , including delaying your period. In a study , researchers found that about 15 percent of participants who took Plan B experienced significant changes in menstrual cycle length, period length, and menstrual appearance. After EC, your period might come late , early — or right on time.

Research from suggests that the earlier in your cycle you take Plan B, the earlier your next period will be. That same study found that taking EC can make your period last longer than normal. This was the case if the morning after pill was taken after ovulation. Your period length might also stay exactly the same. Plan B can cause side effects like nausea, cramps, or headaches , but these symptoms should go away within 24 hours. If you have a heavier period after taking Plan B, you might feel extra tired or lethargic.

This is a normal side effect of those extra hormones. PSA: In rare cases, spotting could also signal an early pregnancy , so track your cycle and take a pregnancy test if you feel unsure.