sex and pregnancy

since I finally got clear to have sex two weeks ago I had infection but this pregnancy my vagina tends be sore afterwards but told my husband don't cum cause I notice being pregnant when he did I'd get a infection. but since he hasn't cum inside I haven't had anymore infections. I miss being on top but I get so sore this time round my husband is obsessed with sex right now .what helps not be so sore or what the best position while pregnant. with my other pregnancy I was fine being on top idk if it cause it third baby or what. but my husband says once our son starts moving where he can see he unsure about sex lol do your husband say same stuff as well