I think my friends boyfriend had sex with me while we were drunk

Basically we all got drunk together, my friend ended up going to sleep early so me & her boyfriend stayed up drinking. I drank so much I blacked out, the next thing I know I wake up and I realized my uterus was sore (like if I had sex with somebody).

At first I tried to think it was my ovarian cyst rupturing but the pain was nowhere near my tubes or ovaries (just at the bottom of my vagina/uterus area and my vagina had felt like it had been stretched out. When I woke up my shirt was down and there was a sheet over me. How should I go about this? I also think he didn’t use protection, because my discharge start smelling like my PH has been thrown off. I haven’t had Sex with anybody so this isn’t some STD surfacing. What should I do?