Okay so me and my boyfriend had sex on the 31st of January and about a minute or two before he came, the condom broke and he didn’t notice. Note: My last period was on January 6th and it ended on the 11th so this was a day after my last fertile window. But he pulled out before came. I knew that much because I saw it happen. We purchased a Plan B pill (because I’m not on birth control) and I took it about a little over an hour after the incident. I had really bad mood swings February 2nd, 3rd and 4th so I expected my period to start within that past week. BUT it still hasn’t started. Is there a reason my period could be late other than pregnancy? Also, am I just being paranoid or should I actually start worrying?