Late Period: Help!

I've recently had sex with my significant other and we used the pull out method. I took plan b within 24 hours to be more protected. I was expecting my period yesterday, the day after we had sex. We also had sex Feb 25 but with a condom. I haven't been experiencing any pregnancy symptoms other than cramping, which was most likely due to my expected period. Can having sex the week perform my period mess with my cycle at all? Thanks.