What should I do with this situation?? I need help, and no negative comments here. I am just here for advice and don’t need any other issues thank you 
So, here’s the situation
Well, let me start back allllll the way from the beginning. My boyfriend and I had allowed one of my best friends that we will call A for this story (which is a male and also his brother from his previous marriage), his girlfriend that we will call B for this story, along with their 1 year old son to stay with us for a little bit. Me and my boyfriend have argued a lot in the past and ever since they have been here, they have been arguing 6 days a week almost all night but be done arguing the next morning. I have a 5 year old daughter and also 36 weeks pregnant with my second daughter. Well this particular argument had started and 3 days later it was still going on. Well B ended up going to her dad’s asking my boyfriends friend to take her over there. Only he didn’t have a backseat so she could not take her son with her at this point in time. Well, the next morning my boyfriend had to go to work. I got my daughter ready for school and laid down to relax and took a little nap. The night before, me and A had a disagreement and wasn’t really on talking terms at this point. Well I messaged B and asked how everything was, she wanted her baby back. I didn’t want to cause any issues because it was just me and A here and I was also in an abusive relationship with my daughters dad so I didn’t want there to be issues with me taking the baby. Well, I said that I could bring him to her when my boyfriend got home just incase any issues were to arise. She said yes. Well, then a few minutes later, she changed her mind and said she wanted me to bring him now and I told her to talk to A first before i do to squish any issue just incase. Again I’m here by myself with him and nobody else. I didn’t want to take chances. I explained to her why I wanted to wait till boyfriend got home. I told her I would take him, just for her to talk to A first. Well next thing I know, she sent me 3 voice notes calling me a bitch and saying this that and all the other and just being really petty (a lot more was said I’m not going to say). So I said if she wanted to she could find her own way here and get him because I’m not doing it after she was being how she was to me as well as the issues that had raised from her being here. So A and B were talking and they came up with a plan eventually. Only time I talked to A is because i wanted to know a little bit more about why she was saying all that stuff that didn’t even make sense because none of what she said was true. She has been that way to him all morning as well. Anyway, so they found a way to get the baby back to her. Later that night, boyfriend, my daughter and I went grocery shopping. We left when he got off work and we stayed in there for a bit. Well we came back and then I started putting dinner together. Nobody was here other then us. A and B walked in with the baby and A had told us they were going to the hotel. So they left and I thought it was the end of it. Well about 45 mins later they came back and B took As phone and started being preppy to every chick on his messenger. Saying don’t worry about what is wrong with A “her man” even though they weren’t together. Well then it goes on to where she starts saying my name and being all jealous to A saying he should go talk to me alone like he always does (again all day we haven’t really talked because we weren’t on speaking terms) and I told her politely to keep my name out of her mouth. Well she goes on to start saying my name again in bad tongue and I have had enough. The last month they have stayed here was nothing but problems because of both of them. I told her to get out of my trailer and to never ever come back. She proceeded to sat she will and then she started threatening everyone in the house, especially my 5 year old that she was going to stab us all and all that. She sat on the couch and stayed there, my boyfriend would have killed me if I got up and tried to get her up and out the door because I’m so close to having our daughter. Another thing I had forgot to mention, she is 8 weeks pregnant. At this time it’s probably about 10pm. Mind you, dinner is close to being done. Nobody ate yet. A had asked to use my phone because she was being way too much and threatening everyone, including himself. So she called 911 and 2 police officers came eventually. She ended up picking up the baby and went outside before they got here then came back in to get a blanket for the baby. After a while of the police here and talking to everyone, she stayed in the police car and eventually got the baby taken away. A came back in and he was devastated. He had court the following morning. This is where I need advice on what.to do. She is apparently saying me, my boyfriend and A are all druggies and I stay away from that, including weed. I’ve told my boyfriend that if he even touches weed, I am gone and never coming back. So he doesn’t do anything. And A, I know he has done it in the past but doesn’t anymore. A drug test would prove nobody does anything but I’m just very nervous that cps will be in mine and my boyfriends life because of what is going on with them. He’s going to be trying to get his son back…and with my boyfriend having a 12 year old along with my 5 year old living in the house with me and her dad not being in the picture along with me getting ready to have a newborn in about 4 weeks, I am lost and don’t know what to do. A little advice would be highly appreciated