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Doctor insights on: Taking Plan B Before Period

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My period is 4 days late after taking Plan B 3 days before period was due. I know I'm not pregnant and I'm always regular. I have cramps. Whys it late?

My period is 4 days late after taking Plan B 3 days before period was due. I know I'm not pregnant and I'm always regular. I have cramps. Whys it late?

Late period: After taking Plan B so close to your expected period, you have used synthetic hormones that have affected your natural cycle. It is not unusual to have an abnormal period or periods after Plan B. It will likely return to normal very soon. ...Read more

Dr. Peter Baumann
876 doctors shared insights

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My period is 4 days late after taking Plan B 3 days before expected period. I'm not pregnant. I'm cramping. I'm very regular. When will it come?

In 1-4 days: Studies have shown that ECP like Plan B usually has an impact on the period, and if taken early in the cycle, may shorten it or cause spotting, and if taken later, may delay it up to a week. The subsequent cycle may also be either prolonged or light, and unlikely to skip it all together. If you don't get your menses in the next 5-7 days, check a pregnancy test. Please use other protection. ...Read more

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Had my period for 6 days normal time took Plan B before period and now i'm spotting for 3 days why?

Had my period for 6 days normal time took Plan B before period and now i'm spotting for 3 days  why?

Plan B: It's common for the period to be irregular for up to 2 months after taking plan b. Be sure to run a home urine pregnancy test 14 days after the unprotected sex. Also consider an effective contraceptive if you want to prevent pregnancy scares in the future. ...Read more

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Took Plan B now I have cramps 4 days before period, what could be wrong?

Can be Plan B: Potential se’s w emergency contraception: tender breasts; changes in menstrual flow (spotting, bleeding, early or late period or spotting instead of period); loose stools; dizziness; headache; nausea/ vomiting; abdominal discomfort or feeling tired. If you develop chest tightness, difficulty breathing, swelling of lips, mouth, throat – call 911. Notify your gyn if your period is 7 or > days late. ...Read more

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Period was 2 days late, but normal. Have had moderate dark brown bleeding for 5 days after period. Took plan b pill 2 weeks before period. Normal?

Period was 2 days late, but normal. Have had moderate dark brown bleeding for 5 days after period. Took plan b pill 2 weeks before period. Normal?

About Plan B...: Plan B can alter the menstrual bleeding for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a home pregnancy test about 3 weeks after sex, because Plan B works most of the time, but not all the time. One should be sure to have a reliable type of ongoing birth control, the PlanA, in order to never need the PlanB again. ...Read more