how would you feel if..

Your SO said "You aren't f'n me..do you know how many women are ready to take me with open arms?" in the heat of an argument. I'm pregnant and my body has been very weird and he always acts like he understands until he wants sex and we try and it's either uncomfortable or I just don't want to. It's gotten to the point where I feel bad for saying "no" because of the comment he made...so I suck it up. The few times where I have said no or I don't want to..he either still goes for it or makes me feel bad for saying no...