Hi :). I know this is going to come off sounding stupid but I had sex for the first time January 3rd of this year and it was unprotected. The next afternoon I took Plan B even though the guy said he pulled out in time. About a week later I got my period, then I got it again a month after but it was so much shorter and I had less cramps and flow then usual. Now I'm waiting for my March period but it has not come yet, it's been a week. I'm really scared can someone please tell me if this is normal after Plan B? 

Thanks :)