Two doses of morning after pills taken one day apart

Dear Ask The Doctor: I had unprotected sex and i got really scared. I took 2 morning after pills(2 boxes x 1 pill) 2 days apart just to be sure. I know it was stupid. Can there be severe side effects?

Dear Megan: You may experience changes in your periods with only spotting or delayed menses followed by a heavy flow. Other side effects may include nausea, vomiting, breast tenderness, dizziness, stomach pain, diarrhea, lower abdominal cramps and even missed periods. If you experience severe symptoms and prolonged bleeding, you should consult your doctor for treatment and control of heavy blood loss.