My girlfriend and I had a condom breakage around a month and a half ago. She took plan b within hours. This was all in the day or two after her period. About a week later she had her period again. She described it as a moderate to heavy flow and not light. That has made me believe that it wasn't pregnancy . But now im questioning it, as her period is now over 10 days late. She has had no symptoms. Im not sure what to think. I havent read about anyone else having two consecutive periods. Is this normal for plan b?