Pregnant,, everyone help

Hi, I'm 15 years old one day I thought it would be fun to sneak out with my boyfriend and we did. We didn't have sex but I did give him a bj. There is a chance the cum got on my underwear but there's a not for sure answer. I did just stop taking birth control and just got back on it again but I waited a month to start up again. I am now 7 days late for my period. Is there a chance I'm pregnant? He cummed in my mouth but I didn't swallow I spit it out... I'm not sure it did get on my underwear. Do not judge me over this. I just need help I've also been waking up nausea and having horrible headaches and already tired,, btw I just started retaking my birth control pills 4 days ago