Help please

I have a question I am 21 years old me and my fiance are ttc are first child together we are living in a stable place together and we are both working and have great jobs we have been together for 5 years well I have something that I’m confused about.. I feel like my body can’t take sperm because I get an infection everytime he cums in me I do use the restroom after sex but I still get an infection is that normal? I don’t think it’s him I think it’s me Also does sperm always stay in you and build up inside you . It really makes me sad because we try but I just get an infection afterwards and we cant do anything for a while because I will smell.. and it’s weird because I use the restroom afterwards and make sure I’m clean down there always. Does anyone have any comment why this keeps happening to me Please someone let me know

. (Little back story my old abusive ex always cummed inside me and he could never get me pregnant but he always gave me infections after sex he was never a clean guy. Does anyone think he may be the reason I get infections because he ruined my body ? We were together for 3 years til we broke up)