help please!!!

okay people are probably going to call me dumb for this but whatever. me and my boyfriend were making out a week ago and one thing led to another and we tried having sex but just the head went in and there was precum. we did that for literally two minutes then i gave him a blowjob so no actual cum was on my vagina. but since then there's been spotting and it isn't normal because my period ended two weeks ago and i've been really tired and my boobs have hurt and i get weird cramp type things. what is happening?