Actually it is even worse if she is pregnant and the babies baby gets pregnant by the same man she got pregnant with. It's an infinate loop of incestious inbreeding. It is much better if she has different men for each in-uturo pregnancy.
It is completely possible! I fucked a girl and got her pregnant, then I fucked he while she was pregnant and got the fetus pregnant too. When they were born, I owed double child support.