i don't mean to sound rude or condescending, but how old are you ? I'm just concerned if you've gotten proper sex ed or how much you know since you're sexually active. Have you told him how his cum hurts ? Also, if you have bv or any sort of infection you would probably notice a change in your discharge, a foul smell, and some itching or irritation. Do you pee after sex ? If you're able to it's also a good idea to shower after since you're not using condoms :)