Very good question... let me create a mock scenario.
The chick dated a dude for a while, got pregnant by accident but doesn't belive in abortions. The father preassured her badly to have an abortion, made her feel guilty for wanting to keep the baby. She decided to walk away from him completely and have nothing to do with him. Now she is 3 months pregnant, she likes you and she is horny (as some women get during their pregnantcy) Now pretend the chick looks like a younger Pamela Anderson / Ashly Judd mix..... what would you do?