Im wondering if I have sex with my boyfriend while pregnant can he go real deep inside of me without hurting my baby?

Your baby is in a protected cocoon, there's no chance of his penis hurting it, no matter how well endowed he may be.

As long as there are no medical reasons for you not to have sex, if you have your doctors okay, than there's no reason not to.

Alty is right. It is impossible for the penis to hurt the baby.