Do I have a right to be annoyed??

THIS IS REALLY LONG SORRY.... Me and my boyfriend are 20 and both in college so we were used to going out and partying quite a bit before I found out I was pregnant in March. For three months, until school ended I basically stayed in my dorm and never hung out with friends because I didn't want to be in a house where people were drinking or smoking even if I wasn't participating. My boyfriend still went out occasionally and I was fine with that. Now we're home for the summer, taking classes at community college and living together for the first time. (little backstory) I have to give him credit, he has REALLY stepped up. He completely takes care of me, basically waits on me hand and foot, is very sensitive to my feelings and needs and I'm so so grateful for that. We had been together for a couple months, but only officially dating for like two weeks before I found out I was pregnant. So I have to hand it to him, I couldn't expect much and he's been amazing. So naturally I try to keep my hormones in check and not get on his back about anything but he said he would stop smoking weed and he hasn't and it's bothering me. Don't get me wrong, I used to smoke sometimes myself, I know many people think it's not a big deal but the fact remains that where we live it's illegal and as a father he needs to be responsible and not do anything that would jeopardize his chances of getting a job or getting arrested. He's in nursing school so he will be drug tested before interacting with patients..... Lately I've found myself resenting his friends because everytime he goes out with them he comes back high and I just think they're so immature. His best friend jokingly told him to push me down the steps when I found out I was pregnant and ever since then I haven't liked him. His other close friend said we had to abort and he even went on to tell a bunch of people I was pregnant before I was ready to announce and I was so scared to misscarry. Do you think I have any right to talk to him about how I feel about his friends?? And is it not my place to tell him he can't smoke anymore? I don't want to be too controlling considering he's been so great otherwise