Any tips on getting my SO interested in sex while I'm pregnant?

My sex drive has been high my whole pregnancy and he just doesn't seem interested in sex.
He'll tell me he has a boner, let me touch it but when I go for more he acts like he is so busy.
I try to not let it get to me personally but it really hurts sometimes. I cry in the bathroom thinking I must be gross to him. 
Any ladies have any tips please?
Anything would help at this point 
Thanks!

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