Secrets and pregnancy

Me and my boyfriend is having our first child together. He is still in is immature ways and always walk away from a situation we have between us such as not telling me the whole story of his nights. I know he loves me and wont cheat but lately things...

seem to be more secretly between us. Should I be worried? Do you think im not giving him enough sex? I am 6 months pregnant.

This happens all the time when boys find out their girl is pregnant because they don't want to take that on, and that's most likely what is going on here.