My now ex boyfriend and I had unprotected sex January 28th and I got my period 2-3 days after, but it ended quicker then it normally does, and now I'm 4 days late on my period and I'm NEVER late, early if anything, and I'm gaining weight but I haven't been eating as much as I normally do. I'm going out to get a test today but I wanted some feedback.  I'm not on any birth control and didn't use the plan b pill or anything and when we had sex it said I have/had a 33% chance of pregnancy.