I'm lucky if I have sex once a week

My husband barely wants to have sex now. Before I was pregnant (now 30 weeks/ftm) he was all over me. As the weeks go by we have sex less and less and it's driving me crazy. It's to a point when I have to constantly ask to have sex. I tell him atleast alittle foreplay will work. It's starting to make me feel unattractive like he's losing sexual attraction to me... I try to get him in the moment and there's always an excuse.