Pregnant friend is smoking weed, getting into physical fights and not prioritising ultrascans, doc appointments and meds…

I have been best friends with her since age 12, I've watched her grow into the adult she is today however I'm starting to question cutting off the friendship as my values, priorities and goals are very different where as hers has stayed the same since she was 14 yrs old. However I for some reason feel responsible for this baby on the way and don't want to leave it in a bad situation.

She fell pregnant in April I was on the phone to her when she found out and the first thing she said was she was going to keep it. She didn't know who the father was, it was between 5 men and she had called up each one of them in the timeframe of 30 minutes of finding out she was pregnant. It was like she was using the news to get some attention from each one of them, and once she had figured out who really was the father ( witch I had to find out as she refused to do the back dating witch took me 2 minutes to do) she just strung the others along. That was the first red flag.

Not even a week into finding out she was pregnant she was sleeping with multiple men and even ended up in a week long relationship with a crackhead, now this is all typical behaviour for her and I don't hold it against her as it is her choice to do what she wants, however now I'm starting to hold some resentment against it because it shows how incapable she is going to be for this baby. And what kind of situations it might be subject to because she won't change her behaviours.

The third red flag was when I was getting calls from her roommates saying that she's been missing for days with a guy and she's missed her ultrasound appointments as well as the doctors and is not taken her pregnancys meds. Now I really started to get worried here because it showed how little she prioritised that growing babies.

A month or two later she had gotten into an argument with her roommate as per usual, and her roommate had finally had enough of my friend going off at her. Her roommate text messages my friend "I'm going to punch you if you don't stop" and my friend lost it and started trying to punch and kick down her roommates door saying "come out and fight me then" (she was doing this for about 20mins with the roommate threatening to hit her behind the door). The roommate ends up coming out and bashing her and my friend gets scratched up a bit. Now I want to start off by saying that no one should be laying a hand on anybody especially if they're pregnant and she was definitely in the wrong, however as a 7 month pregnant woman you should not be putting your baby in situations where they could get harmed. Now this situation kind of did it for me as I was on the phone the whole time and I had told my friend prior to her instigating the fight that her baby will get harmed if she starts a fight.

And to top it off, this whole pregnancy she has been smoking weed heavily and last week got a drug warning for possession from the police.

There's so many other little details I could get into but I hope you get the gist. I just don't know what to do, I really want to cut off the friendship as I don't have the energy to deal with these behaviours anymore but I feel like I'm responsible for preventing those behaviours from harming the baby, i want to have a conversation with her about it but everytime I try to she blows up and gets angry and I just don't deserve to have someone like that in my life however the guilt I will feel if something happens to that baby will be immense.