Cramping two weeks after sex? Has this happened to anyone?

I had unprotected sex a little over two weeks ago i had just got off my period so I thought that it would be ok my period was jan 24 and had sex on the 29th he did *** inside me and at that time i had what i think was egg white mucus but I didn't think you could ovulate that soon after a period. I then had sex again on the 9th of this month when i would have been ovulating and he pulled out. At that time and still today all I've had is thick white discharge. For about a week now my breast have been really tender and for about 4 or 5 days I've had light cramps which I never get I have been more naseaus than usual i normally have a really strong stomach and now I gag to the sight of everything this morning vomiting while changing a dirty diaper lol. What could the cramping be could I have gotten pregnant after my period or could the cramping be from the sex on the 9th implanting