I was literally searching for this yesterday because me and my husband are so scared of hurting the baby. Actually, my gynac said it's completely safe in a normal pregnancy. Did anyone else also feel a bit crampy afterward or is it just me?
Sperm itself is not harmful but you must confirm with your gynecologist once if your pregnancy is normal. In some cases with history of bleeding or early labor risk, doctors advise strictly to avoid it. Better safe than sorry, so just ask your gynac in your next visit.
Look, unless your doctor has specifically asked you to avoid intercourse due to complications like low placenta, it is perfectly fine. Sperm doesn't reach or hurt the baby because of the thick mucus plug. Go ahead and don't worry, but use protection if you are prone to infections.
During my pregnancy, we had normal relations and my doctor said sperm contains some substances that are actually okay, but they definitely don't harm the baby. Just ensure your partner is hygienic so you don't get any UTI, which can be annoying during these months.