How soon should your period start after you have taken emergency contraception?

Menses. Potential side effects with emergency contraception can include: tender breasts; changes in menstrual flow (spotting, bleeding, early or late 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 doctor if you miss your period. See below.
Depends. It depends when you took the pills .Usually you will get your period on expected time if you are not pregnant.