Hi everyone, my girlfriend and I have been dating for about 9 months and last Friday night we had sex. The condom broke so the next morning we got Plan B. She forgot to take her birth control Wednesday and Thursday before we had sex but she took it Friday( the day of). She was supposed to have her period yesterday but it still hasn't come. Is it just Plan B messing with her cycle? It's been a while since ovulation so we know the chances of pregnancy are small but we are both a little worried about the situation. Thanks for your advice.