Bleeding during sex

I recently had my depo injection (contraception) and we left it for 5 days to have sex but when we did I was bleeding really bad by afterwards there wasn’t any blood at all and it’s been 2 days now and there’s still no blood, is this normal? could it be that he’s popped my cherry? Or something else? I’ve had an STI check and it’s came back as negative so it’s not that