We have done it twice so far Gwen & I'm now almost 21w.

I was worried cos it had taken us so long to get pregnant that I didn't want to do anything to hurt the baby, even though I knew it wasn't going to. But then after both times I had light spotting, only maybe a drop, which freaked me out & we decided no more for a while. But though apparently it is common to spot a little bit after intercourse when pregnant.