bleeding two days after sex

bit of a follow up from my last post but i ‘lost my virginity’ (p/v) two days ago and bled during sex, it was pretty painful (bearable, but i wasn’t a fan), but i stopped bleeding quite quickly and have felt fine, no bleeding/pain since.

i just woke up and am bleeding as though i’m on my period (bright red blood, i have light periods so there’s not that much of it, probably about as much as i lost during sex). it’s also worth noting that i started birth control just over a week ago but i’ve been having bits of darker brown discharge that i’m guessing is the ‘spotting’ caused by the birth control, so i don’t think that’s it? it’s also not my period because i’m not due on for a good couple weeks. basically, is the bleeding normal??

i’m also a large stresser hahahha so can someone please reassure me that i’m not pregnant, we didn’t use a condom but like i said i’m on birth control and i bled so we stopped pretty quickly, he didn’t ejaculate and there was probs no ‘precum’ but i guess there’s a chance there was - i’m probs being unnecessarily concerned and i know there’s such a slim chance that both any sperm ‘got through’ and that my birth control somehow failed but i’m 17 and do not want a baby

thanks in advance:)