Pregnant or not

[Clerkgirl]

Earlier this month I had sex on December 2nd and 6th, unprotected, I was ovulating and my bf came inside of me. Since then, I've been cramping like crazy almost like a period but I was like 2 weeks away from my menstrual cycle. On top of that I was moody, my breasts seemed like they were tingling almost like they were heating up, I was fatigued and my mood swings were outta whack. Then it was getting closer to my period and thought it was just pms and I happened to get the worst of it. So the 22nd was coming closer and I wanted to get it over with bc my pms was awful. My periods are pretty much regular and I don't go over30 days. Last mth, I was late by 4-5 days too. Then I got it early by two days out of the blue and it only lasted for 2 and half days. I took a pregnancy test but got a negative. I still feel like I'm pregnant but I could be very wrong. I was just wondering if other women had this problem and ended up being pregnant or tell if it was something other than pregnancy.