Any answer will be appreciated, Thanks.

Ok. Me and this guy are pretty much "friends with benefits" because we both know its going nowhere further than that. We got drunk one night with a few friends and the four of us decided to have a little fun. Anyways we played a tease game with a deck of cards we had and since the other two were married, we decided we would be one another's game partner. One thing led to another and we ended up having sex without protection. The weekend after that we had sex again, but two nights in a row this time. The second night in a row we had sex I had started my period but my cycle had paused for a few hours otherwise we wouldn't have done it at all. The last time we had sex was two weeks ago yesterday which puts the first time three weeks ago. The last time we had sex, my period did finish out its normal cycle of five days but I'm worried that since we never used protection I may be pregnant because I don't know when I ovulated. Two nights ago, I had only three beers and I got sick really bad [I can usually hold about 7 or 8 before I vomit depending on how fast I downed them]. Then the next day, I got sick again but nowhere near as bad as the night before. My sides and my stomach have been real sensitive and I have been getting headaches a lot lately and I never get headaches. I have been feeling nauseated almost all day long each day since I got sick and a bit dizzy, too. Also, I have been sleeping and being lazy a lot more and I don't do anything to make myself so tired. My breasts aren't tender but they are a lot softer than normal. I am feeling bloated like I do sometimes when I am on my period but it feels a little different- not much different just a little tighter, too. Lately my legs have been hurting if I stand on them too long and they haven't hurt like that since I ran track in middle school. I am hungry almost all the time now and before I got sick the other day, all my body would let me take in were one or two small meals a day. Also, I am a bit less sociable now and I'm usually outgoing. I don't feel like doing just about anything anymore other than being lazy all the time. Is it possible for me to start feeling these symptoms even after only three weeks? Or am I just being paranoid at the fact that I could be pregnant? Any answers would help. Also, is it too early for me to be thinking about taking a pregnancy test or should I go ahead and take one now? PS: sorry for the book lol I am just a little worried at this point.