Plan B, also known as the morning-after pill, is a type of emergency birth control (contraception). It’s normally used to prevent pregnancy for women who’ve had unprotected sex, or whose birth control failed.
There are serious side effects of the morning-after pill (plan B), which include:
Nausea or vomiting
Dizziness
Fatigue
Headache
Breast tenderness
Bleeding between periods or heavier menstrual bleeding
Lower abdominal pain or cramps