A Little Bleeding After Sex

My Boyfriend and I had sex last night after about two months since we attend different colleges. When I went to wipe after peeing, there was a little blood on the tissue and when I woke up this morning, there was a bit more inside my panties. I was wet and the sex didn’t hurt but could this be because I hadn’t have sex in a while or because of his penis? His dick is on both the larger and thicker side and he was going in pretty deep. Thanks in advance ladies!