History of uti and yeast infections. after having sex with new partner my vagina has a foul smell to it? is that normal my ph levels are unbalanced?

Possible infection: The odor suggests an infection. Please see a health care provider for examination

Need to fix pH: You likely have pH imbalance following UTI and yeast infections. If you smell a fishy odor after sex then you might have a bacterial infection. I would recommend taking a good probiotic daily and eating active culture yogurt for a few days to see if things improve. If no significant improvement then you need to see a practitioner for evaluation.