I was having sex with my girlfriend, but all of a sudden she started bleeding. I didn't mind, I just kept on going. Didn't even care that she was in labor.
I think you're making a joke about having sex with pregnant women.
What is wrong with you? Do you know nothing about the birds and the bees?
Would your girlfriend like it if she heard you tell that joke? It dehumanizes women and is hurtful to them.