WIth my first pregnancy I had the urge, but DH was too scared to dtd, he thought it would hurt the baby.
Second pregnancy, wow!!!! I couldn't get enough of it until about 7 months, then I just got too big & uncomfortable.
It took 7 months for my urge to come back - doesn't happend that often though because DH works away for a minimum of 10 days, then is only home for 4.
Sam must have a sixth sense - he pretty much always wakes up for a feed when we are in the middle of dtd.