Husband and "bro time"

My husband and I got married a month ago and we now live together and our baby boy is due in November. He likes to go out and drink a good bit with his buddies but never really invites me. Should I be upset? I'd like to go out and do stuff with him and not just be left at the house all the time. Im scared when the baby gets here he's gonna keep wanting to go out all the time. Do you think things will change once the baby is here??