Not sure what to do

Okay I am 20 weeks pregnant and have no interest in sex. This is an issue just because my husband has said time and again he finds me even more attractive while I am pregnant because he knows we are making a life together. I have to force myself just to be intimate with him once a week. I feel horrible because I still find my husband very attractive and am still madly in love with him but I am at a loss. Any advice? I don't want to lose him.