Pains in the abdomen and nipples with nausea, pregnant?

I have been very nauseous for a little over a week, even throwing up. I have very sore nipples, but the rest of the breast is fine. I keep having sharp pains in my lower abdomen. I am very tried, and have been having slight headaches. I got my period 2 days ago, but it's def not like my normal period. Usually my period is normal to light even at the beginning, but it has been very heavy. I have never had craps, stomach pains, nausea, headaches, etc. when I have my period. I always considered myself a lucky woman because of that. My vagina has been a little sore as well. I never have pms either, so this is very strange to me. I have been having unprotected sex with my boyfriend for almost 2 months now and I was wondering if there was anyway that I could still be pregnant. I have not taken a test yet because I was hoping this would pass but it hasn't yet. Please help!!!