no symptoms occur to me like morning sickness

Hi. I'm 18 years old. My last period was last week of April 2014. So it's already been two months since my last menstruation. I am still irregular. But Between those months, my boyfriend and I been doing rough sex. Whenever he inserts it in, we make sure there is no pre-cum and he says that he can control it. He never came inside of me. We only do a couple of thrust or whatever. Anyway, im worried because maybe im pregnant. Just maybe. But no symptoms occur to me like morning sickness. My belly is a little fat and sometimes i think it's a symptom but im born to be a heavy eater so my belly is squishy and soft. So i am kinda confused if it's a symptom. Also i took a pregnancy test, and it says negative. My boyfriend said that I just finished ovulation last week. I reported him about my vaginal discharge last week. Now it's gone. So wew But here's the thing, i need opinions if i am pregnant or not cuz srsly wprrying drives me crazy and my period is still not coming. So please help me.