Being pregnant and your bf wanting to go out

So since I've been pregnant my bf has been wanting to like drink with his friends and there's a concert coming up that he automatically is saying he's going to without me and it's probably childish but he never wanted to do stuff like that before and now that I'm pregnant he wants to go. I just feel like after I have the baby he can run off to Vegas and never come back for all I care but right now I just don't think he should be going out. Is that selfish of me keeping him from going to a concert where he's gona drink and there's probably gona be young slutty girls and I'm home pregnant. It also makes me mad because if I wasn't pregnant and I wanted to go to a concert without him he would die and now he likes to tell me "i don't care what you do I trust you" I call bullshit. Btw we live together planned our baby and are with each other 24/7 pretty secure in our relationship so I'm not necessarily worried about him cheating but hey why have that temptation and stress me out.😒I feel kinda bad though like if I don't let him go hell hate me.