Not Getting Along!

So me and my boyfriend have been trying for a baby for a year and a half. Now that im pregnant I feel like im losing him. Theres no lack of sex, to me it looks like he likes our sex even more. but i dont get why out of the blue, i feel strongly that he doesnt even want to be by me as if i just caught a deadly disease..

then when I get upset over it, he acts like its all me and im the one pushing him away when all i want is him to be all over me and be about our baby..