Help me ease my thoughts please!

Why do I think I'm pregnant when I never even had sex with my boyfriend and all we do is just pretty much foreplay stuff (bjs and rubbing)I always worry that he touched or grazed against his penis before he touches me and when I asked he always says no and his hands are dry. But why do I worry about this? :c please help and I never paid attention to what's normal for my body so i don't know what's normal and what's not because before I never thought that much about it. :c