Plan B is an emergency contraceptive pill that is taken orally after unprotected sex to prevent pregnancy. The most common side effects of Plan B include:

• Nausea or vomiting
• Abdominal pain
• Fatigue
• Headache
• Dizziness
• Breast tenderness
• Irregular bleeding between periods or heavier menstrual bleeding

These side effects typically last only a few days and are not serious. However, if you experience severe lower abdominal pain three to five weeks after taking the morning-after pill, or if you have bleeding or spotting that lasts longer than a week, you should contact your healthcare provider. These symptoms can indicate a miscarriage or an ectopic pregnancy, which is when the fertilized egg implants outside the uterus.

Its important to note that Plan B is considered safe for most women, and there have been no reports of serious problems out of the millions of people who have taken it. However, its always a good idea to talk to your doctor about possible interactions with other medications and to ask about any concerns you may have.