No sex drive!

So how do I spice up mine and my husbands sex life. We have probably had sex 15 times in the last three years.  (We have a two and a half year old and sex stopped in my second trimester because he said it made him feel weird). I don't know how to get it going. I feel stupid dressing up in lingerie and am not sure how to get him in the mood.  I know he isn't cheating on me because we work together and are always together at home so he doesn't have time for that to happen. I have talked to him about it and he says he just has a low libido. I feel unattractive and not wanted and have never had this feeling or problem before. We have been together for six years and married for four years.  We used to have sex everyday!  We are both 34 years old.   He also sleeps on the couch most nights too. Ugh.  Any advice?