Q:

Does Plan B affect the patient's next period?

A:

Quick Answer

Plan B can make the patient's next period a few days early or late, according to WebMD. In addition, some women experience unexpected bleeding, and some may notice a difference in their period's flow.

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Full Answer

After taking Plan B, women may notice the following differences to their periods:

  1. The period can arrive a few days late or early, or it can arrive on time.
  2. There may be light, unexpected bleeding before the period.
  3. The period can be lighter or heavier than usual.
  4. Abdominal cramps may be heavier.

Women who do not have their period within three weeks of taking Plan B should take a pregnancy test to ensure it was effective. Plan B is most effective when taken within three days of unprotected sex, but the efficacy reduces over this period. Other side effects of the medication can include:

  1. Nausea, vomiting and abdominal pain
  2. Breast tenderness and headaches
  3. Dizziness and fatigue

Although it is rare to experience severe side effects, women who encounter the following should seek immediate medical advice:

  1. Unexpected rashes and itching
  2. Uterine hemorrhage and heavy or unusual cramping
  3. Vaginal hemorrhage
  4. Side effects that continue getting worse or do not go away
  5. Vomiting within two hours of taking Plan B, as this may mean another dose is necessary

Certain individuals should avoid taking Plan B. This includes women who suspect they may already be pregnant, those who weigh more than 165 pounds and those with a history of abnormal vaginal bleeding that has not received medical attention.

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