Cramping and bleeding during/after being fingered?

Okay, so lately my boyfriend has been fingering me. The last couple times, I've been able to orgasm.

Right as I'm about to climax, I get really bad cramps that also last for a while. This is the longest they've lasted, is probably close to twelve hours.

Also, I typically spot after for a couple hours. It wasn't bad last time, but this time it was definitely worse. We didn't know, and when he fingers out, it was covered in blood. Gross yes, quite a shock to both of us, since it's never happened during it, but he took it well, and was pretty concerned.

I'm on the birth control pill. No, my boyfriend and I are NOT having sex.

I am not having problems with producing my own lubrication, and his nails were cut short and were not sharp. My period was about a week and a half ago, so it shouldn't start bleeding because of that. He was also not being rough.

We're both stumped. We're not sure if it's normal, and I wanted to check here before I went and called my doctor, as it would be pretty difficult being in school and stuff like that.

Please do not judge - my boyfriend and I are being responsible, we are choosing to wait for sex, and instead choose to use manual ways to pleasure each other rather than jump into penetrative sex too soon, and have something we are unprepared for happen.

Thank you for any help, I will pick the best answer.