Hello, last night I spent the night st my boyfriends and we had sex. Well,first he fingered me. Then, we had sex. When we got done I was in so much pain I was cramping. So, we d down and he held me tight. Then, when we woke up. I hadvstarted my period. He was so calm about the blood and everything. But my question is could the cramps be from my period or the sex?