My gf and I had unprotected sex. Being cautious we took plan B the next day. The day she took Plan B was the day she started ovulating. The Pill was taken well within 24 hours. Theres has been no unprotected sex since shes taken the pill. Its been two weeks since she took the pill and her period is a week late, but now she's experiencing stomach pains. Could this be the pill making her period so late? she had never taken it before?