Sperm threw off my pH

Me and a guy were having a pretty fun New Years and he came inside me for the first time (he’s always pulled out). I was nervous because he usually ejaculates a LOT at a time lol so when I got home the next day my pH was so off it was ridiculous. I used some boric acid suppositories for 3 days and it did the trick, but wow, that never happened to me before. My ex wouldn’t pull out when I was on birth control and I never had that issue. I guess your vagina just doesn’t agree with certain sperm? 🥴