What to eat when pregnant: The 12 best foods. Close this dialog window View image. You will need to have unprotected sex to get her pregnant, so make sure neither Pregnant Lady Gif Photo nor your partner are carrying any STIs before you do. New to BabyCenter. Breastfeeding during sex. Did this summary help you. In addition, eat fatty fish like iGf, tuna, and bluefin, which may have an increased effect on your sperm production.