Hello..pls help im preg n having trouble in the bedroom?

im 4 1/2 moths preg, with my second bh... im having trouble with intimacy, it feels unconfortable, I cant take it...im trying for his sake u know but its so bad!! its not painfull but oh so unconfortable...is smth wrong?? with my first preg this never ever happened!!! im so frustrated I feel its takeing me appart from him and its affecting my relationship (we have a very open one, even thou I exlained I feel that may be he thinks it has to do with him...) what can I do?