Why does a girl bleed and her vagina pains after one day of sex?

Sex bleeding and pai: The first question i would ask is what are you having sex with ? Secondly is there any roughness associated during sex? Thirdly is your partner too large for you? These need to be answered first.

Vaginal pain: Even normal sex can cause minor trauma, such as tears or bruising, which can be painful and bleed. You should be checked by a gyn, especially if it keeps happening.