Is it safe to have sex when you're pregnant?

Yes, its safe. No problems if you don't feel any discomfort.
Yes it's safe but. Try the side lying position so there's no pressure applied on the uterus (and if u do the missionary position, the fetus may experience some trauma and will complain to u and ur spouse about the experience when he or she gets out of the dark, watery environs of the uterus. Very bad joke!) best wishes! http://thestir.Cafemom.Com/pregnancy/140898/10_best_sex_positions_while.