You've got to remember too that it isnt all about having to dtd, you can be very intimate in other ways like massage, cuddles, stroking and *ahem* - you know what.
I find it hard sometimes to dtd because i feel like there is 3 of us and when we do bd the baby goes crazy and it turns me off.
If you are feeling insecure about how you look, turn the lights down or buy some nice underwear that makes you feel sexy. Your hubby probably thinks that you are the most gorgeous creature i the world but i do understand how we may not think this about ourselves sometimes when we are pregnant.
PS - have fun tonight