I had sex with my boyfriend on a Friday unprotected and he pulled out before he came. Then we had sex on a Sunday when he pulled out he thinks he may have came in my a little. I bought a plan b on Tuesday. So my period was suppose to come on the next week. I came on that next week but it was a dark red and only stayed on for 2 days. Now I have broken out with bumps on my face and my eating have increased and I have gained weight what could it be.