Am I sick? Or am I pregnant?

For the past little while I have been thinking that my abdominal discomfort and other symptoms were because I'm sick, I thought I had stomach ulcers. I guess that could still be the case, but the more I think of it, the more I think I could be pregnant.

To start off, I am 18, almost 19 years old. I'm not on the pill or anything, and back in April (around April 14th) I was at a party. I'm going to cut right to the point, I ended up having sex with this guy, he told me he was a virgin. He didn't use a condom and he pulled out when he "finished" but we all know it can happen before that. That was a one time and one time only thing, we don't talk anymore and I am glad for that.

Now, I have always had a very sensitive stomach. I almost always have a little bit of abdominal discomfort. But over the past couple weeks I've been pretty sick. Nausea is all day long pretty much, constant abdominal pain, exhaustion, back pain (only a little, could be from working out), things that I used to love make me sick. I do smoke, and the smell of it last night made me so nauseous I couldn't even smoke. Also, mcdonalds was always my favourite food and now I can't even take one bite without feeling like I'm going to puke. I dont know if this one is a pregnancy symptom, but about a week ago a friend was at my house and he spat and I literally had to get up from my bed and run to the bathroom to throw up. I literally threw up from the sight of someones spit. Even thinking about it makes me nauseous