Hello, and I hope I can help you today.
Sexual activity does not pose a risk to the pregnancy
or baby in normal healthy women, and having an orgasm, though it may produce some temporary uterine contractions, is also not harmful.
Some women experience spotting from sexual intercourse during pregnancy, which is caused by the tissue on the cervix
, the opening to the wound, (because it is very vascular during pregnancy and even minor trauma can cause some temporary bleeding). This bleeding also is not harmful, so if you do have bleeding after sexual activity I would just wait until the bleeding stops or one week, whichever comes first, before attempting to have sex again.
I hope I was able to adequately answer your question today, and that my advice was helpful.