When you take Plan B, also known as the morning-after pill, it can have several effects on your body. Plan B contains the hormone levonorgestrel, which can prevent ovulation, block fertilization, or keep a fertilized egg from implanting in the uterus
. Some common side effects of Plan B include nausea, abdominal pain, tiredness, dizziness, changes in vaginal bleeding, breast tenderness, headache, and a heavier or delayed period
. It's important to note that Plan B is intended for emergency use and is not a regular form of birth control. It should be taken as soon as possible and no later than 72 hours after unprotected sex for maximum effectiveness
. If you experience severe or prolonged side effects, it's recommended to consult a healthcare provider.