Tiffany, we all worry when we're pregnant (and then when the little darlings are born we keep right on worrying). I used to get a tiny bit of brownish discharge after BDing when I was pregnant last time. When I asked the midwife about it she said that it was probably just a tiny bit of blood from the cervix so it wasn't a worry. If its bright red or has clots in it then you should get to a Dr ASAP. It might be worth making an appointment with your care provider so they can check it out and put your mind at ease a bit.