Foul Odor after Insemination

Hey ladies. I’ve been having this issue on and off for a while. When my partner ejaculated in me I always get a foul smell down there a day of a few days later. It’s not BV or any STD’s of hygiene issues. It’s more of a PH imbalance issue. I’ve tried Monistat, Refresh, hot baths, vinegar douche. It’s mostly been temporary fixes and it takes a long time for me to get back to normal. This throws off all the fun TTC when there’s a funny stench in the air. Has anybody else had this problem and what has seemed to been the miracle trick to getting your PH back on track or killing that dead sperm that’s still up in there?! Help!!!!?!?