DH and I were too afraid in the first trimester as well, Smithy. Not to mention the crinone and pessaries were the biggest turn off for me as well lol.
We DTD a few times in the second trimester, but once reaching the third tri, DH was absolutely freaked out about it all. He was so worried that DS would arrive early if we did. He would get cranky with me if I suggested it and backed him into a corner PMSL...

Completely normal feelings considering all you have been through to be at this special moment in your lives