I had unprotected sex with my boyfriend and it feels like somehow he cut me on the inside of my vagina and we had sex the next day and it hurt really?

Vaginal tears : Tears of the vagina occur during consensual sexual relations and can be quite dangerous. Using lubrication and getting used to a certain degree of sexual activity gradually can help avoid tears. However, the best advice in this situation is to get examined by your OB/GYN, especially if profuse bleeding or pain are present. Smaller tears heal with rest but larger tears require medical attention.