Slight vaginal pain after sex

Now in 3rd trim, is it normal sometimes our vagina feels slight pain/sore or even feel like theres a slight tear after doing sex? Not the whole vagina but specifically the perineum area, the tissue/skin below our opening. It doesnt necessarily hurts when doing but only after the deed. Is this normal? Or is it because of pregnancy our vagina is a little sensitive ? I cant imagine how itll be like giving birth vaginally 😵‍💫 #FTM