RANT! Might be long but desperately need advice

Ok so my bf and I have been together a long time (5 years in November) and living together since April. And just last month we found out we were expecting. I'm 8 weeks exactly today. We're not necessarily in the best situation right now but I decided to keep the baby and try my hardest to make it work. But my boyfriend recently lost his (very well paying) job, and despite this I've supported him and been working my ass off to save money for the baby we have on the way while he looks for another job. The problem is, he hasn't been looking for another job! At least not from what I've seen. He says he's tired of being in the workforce and wants to be a rapper 😑 like really?? I mean, honestly he is talented and I believe he can do anything he sets his mind to, but a rapper of all things? Do you know how hard it is to even get into the music business?? It's not impossible but it's pretty damn far fetched to actually be able to make a living from nothing but making music. Ever since I found out I was pregnant, our relationship is starting to go downhill. From him losing his job to suggesting I get an abortion (which I considered for a little bit before deciding that it wasn't for me) we've had a lot more conflict than usual. And lately it's gotten worse since he started hanging out with certain people who encourage him to stay out ALL night drinking and partying. He leaves around 9 or 10pm without saying a word. He won't tell me where he's going, how long he'll be gone, etc. So I wake up at 3 am expecting him to be laying next to me and he's STILL not here. So I get worried (he knows I have bad anxiety) and start to call and text him to make sure everything is ok. No answer. No calls. No messages. Nothing. I figured he'd be home soon and maybe his phone just died or something so I went back to sleep. Then I get woken up by loud banging at 6 am (I have work at 9) and it's him drunkenly trying to get into the house 😑😑 I proceed to ask him where he's been all this time and how he got home when he's so drunk. Apparently he "had a few drinks like 6 hours ago" so he drove home when he's clearly still pretty tipsy. So not only did he stay out all night partying when he has a pregnant gf at home worried about him, he was drunk driving! I'm totally against this behavior. If those people were really his friends they'd call him an Uber or something not let him drive home drunk all by himself. He put himself in danger knowing we're gonna have a baby and this is not the first time it's happened and I'm getting pissed off. All he wants to do is rap and smoke weed and get drunk. But he's doing this now of all times??? I wish he would grow tf up and stop partying so much. That's what single people do. Not people in a committed relationship with priorities. On the other hand I'm wondering if I'm overreacting because while we are still young and won't be able to have time to ourselves once the baby is born. So my question is... should I just let it go and let him get the smoking, drinking, partying etc out of his system before we have the baby? Or should I address his behavior now before it becomes a habit? Obviously i can't just dump him because it's been 5 years, I love him so much and I already am attached to our growing baby and I want us to be a happy family. Am I wrong for thinking he should be at home with me because I'm pregnant with his child? How do I tell him that this is bothering me without starting an argument? I appreciate any advice.