Rape Investigation. Did I do the right thing?

Went out drinking with friends. Ended up back at a friend of my friends house. We were all drinking. I thought this guy was cute. We’re two legal adults & I consented to sex. During sex he had told me to turn over (doggystyle) & I did. He started to really hurt me & I tried telling him to stop. He held my body in place and started going harder while I laid there & endured it. Shortly after he came inside of me. My friend was sleeping in another room that was locked with her boyfriend & was my ride so I anxiously waited till morning. I fell asleep & woke up by this guy slapping me. (The one I told to stop) He slapped me so hard he left a handprint along the side of my face & started screaming and threatening me to get out. My friend saw him slap me and grabbed my purse & we ran out. I didn’t know what to do so I called my dad. He told me to call the cops & I did. Told them what happened a few hours prior as well as him hitting me. A victims advocate took me to the hospital & I did an extensive examination to see any trauma on my body as well as gather DNA evidence. She was able to see a significant abrasion along with blood & white stuff (which she assumed was his cum) & I guess the police took him to another hospital to do dna testing on him as well. What gets me is the fact that I consented to having sex with him. But felt like my right of consent was taken away when I wanted to stop. I also found out that he unknowingly recorded me in the beginning of sex without my permission. & when the police interviewed him he showed them this video. I didn’t know he recorded me, & I don’t know what you can see. However during all of my interviews, I repeatedly told them that I consented to sex in the beginning. But it became forceful/painful & fucking disrespectful because instead of stopping he went harder and finished in me. The hospital gave me plan B and a set of medications to prevent any potential STD’s. I don’t know if I should have handled it differently. Part of me feels guilty because I did want to have sex with him. But what he did was wrong.