Crazy Mother&Sister In-Law

I really just need to vent to someone who might understand my situation. I’ve been with my boyfriend 4 years and we’re currently expecting our first child together and I’m currently 7 months along. Me and his family had a rocky start, his sister never liked me and we’ve never made amends me and his dad went through a rough patch but now have a good relationship & up until last month me and his mom had a good relationship as well until the sister and mother rekindled their relationship and have teamed up against me. They are saying I am talking about them behind their back and making up all these horrible things about me. They have taken it as far as threatening to come beat me up while I’m pregnant. ( These are not highly educated or completely sober individuals btw ) and I just am so hurt they would do this to me while I’m pregnant. I’ve endured this abuse for years from them but now as I’m bringing their nephew/ grandson into this world, it hurts even more. My boyfriend has stuck by my side and stood up for me through all of this and agreed he will not let his mother near our baby until she apologizes and sobers up.

Am I wrong for telling the mother there is no chance she will be coming around my child? Would I be taking it too far getting an order of protection to let her know I’m serious? I deserve respect and I will not let someone around my child who threatens me or calls me names.