Need intimacy!

So i honestly have no idea what to do. My wonderful man and i decided to try and have a baby. We haven't been trying very long but i feel like he isn't interested in having sex anymore. He doesn't try or even respond to my advances. What do i do? What is going on? I've tried talking to him and he doesn't give me answers. Is he cheating or just doesn't want a baby? Help please I'm desperate and my self esteem is in the trash.