My period ended January 28th. I had unprotected sex on January 31 and February 1st, he pulled out every time but i am aware of pre cum. I took plan b February 2nd. 5 days later i woke up and there was blood on my underwear. It lasted about 4 days, it was much lighter and shorter than my normal periods but whenever I used the restroom, quite a bit more blood came out. Could that have been a period..? or just spotting? My period is already pretty irregular (Sometimes I'll go a couple of months without getting one) however my average cycle is roughly 37 days with my period lasting 6-7 days. I'm supposed to get my period at the end of the month but I'm having no PMS symptoms at all, and little to no vaginal discharge which is odd. Is it likely that I'm going to miss my period?! I'm worried about possible pregnancy. How likely is it that i'm pregnant?