I need help!.

So two months ago a day after my period my boyfriend and I were messing around and he wanted to dry hump. But we were naked. And I felt something cold. I reached down to touch my vagina and nothing was on it?. Then a few weeks ago my boyfriend and I had sex but we were messing around in the shower and then we had sex in the bed. But we used a condom. Im kind of worried about being pregnant. I'm not having any symptoms. And I've been addicted to checking my stomach size like every hour and I'm really worried what do I do.