We didn't do it until after the first trimester cos I was bleeding, then it was fine, but can't actually remember when we restarted- maybe around 18weeks?
I thin kyou'll be fine, once you do it once and its ok, you don't worry.
Also, I had v high sex drive for a while there so used to jump DH a lot for a while, now we keep talking about dtd to start labour, but we're all talk no action for the last few days hehe.
I think I'd need a crane to get me into position actually

Vic- I was at my peak around 30-34 weeks!