pregnant or stressing? HELP

okay, a few days ago me and my boyfriend were hanging out and we didn't have sex, we never have because I'm waiting, but we still did things.. I did nothing to him but he fingered me once and then my pants were off and he rubbed his penis on my vagina.. he didn't cum but he may have pre- cummed... I know that could possibly get me pregnant but the tip didn't even go near my hole.. he just kinda rubbed against the whole thing in general.. I was supposed to start my period today and I haven't yet and I'm really worried because my stomach has a weird feeling lump in it and my dad says it's a pulled muscle and I've been stressing so badly lately because of a few different thing and I just need to calm down and I need some help