Need advice

Hello everyone! I have noticed that when my husband and I are having sex frequently and he is cumming inside me I begin to have this weird odour. I am bathing everyday and I go pee after sex but it still smells like I might have BV. Has anyone else ever had this? When we aren’t having sex as often or go a few days without it I don’t get it. Just not sure what I should do because I don’t want to keep going on antibiotics all the time. Thanks in advance :)