Husband won't have sex with me!

So I am 16 weeks pregnant and I want sex all the time! But I work 6 days a week and we have 2 other kids around so I am ok if we only have sex on my day off since the kids are in school. While the last 2 weeks that I was off he will not have sex with me. He says he feels weird since I am pregnant, but when I was pregnant with our daughter he didn't feel weird. It is extremely frustrating. Any ladies going through this or could give me some advice otherwise this is going to be a long pregnancy.