sex during the third trimester

Is anyone else struggling with sex as your belly is growing?
My husband and I have tried to have sex several times and he freaks out then loses his hard on in the middle of sex. I think it is mental because he swears he is still attracted to me and he can get it up. He says he feels like he is hurting me because certain positions are uncomfortable for me. 
Any certain position working for you and your SO? Unfortunately doggie style has never worked for me even before pregnancy...it just hurts. 

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