Women using the Morning-After Pill may experience a change in their next period. It may come early, on time, or be late. Most women will get their period 7 to 9 days after treatment. If your period has not occurred by 21 days after treatment, you should check this out with a pregnancy test.
Half of women using this method will experience nausea and some will have vomiting. Take the Morning-After Pill with food to minimize this side effect. When vomiting occurs due to the Morning-After Pill it probably indicates that enough hormone has reached the blood stream to have its desired effect. There is no need to repeat the dose.
If the Morning-After Pill fails to prevent pregnancy, there is an increased chance it is a tubal pregnancy.
Common side effects include breast tenderness, fatigue, headache, abdominal pain, and dizziness. Since the Morning-After Pill is a short-term treatment, these symptoms should resolve shortly after you complete the two doses.