LONG RANT sorry , Annoyed !!! MIL .... Advice

Ok so maybe it's just the hormones ! My boyfriend and his mother have the worst relationship in my opinion , his mom is the type to get mad over EVERYTHING his days or does and always puts his brother or family against him when she dosnt " like " what he says or does ! Also is the type to want to call the cops on him for ANYTHING, knowing he is the oldest and the ONLY one that works and helps her in that house , her actions seriously piss me off ... His other brother are 18 and 19 but in her eyes ( they are my babies they don't need to worry about working yet ) My boyfriend is 23 and " has " go help her with the house bills and his brother bills otherwise it turns in to huge problem , ( yes we are definitely moving out within the next month or so just she makes it almost impossible to save begging and asking for money all the time knowing we are the only ones in that house that really need to leave with a baby on the way and have our space ) it almost feels like she does it on purpose she LOVES to talk shit about me to him and I've overheard her saying many things about me and my family to him on the phone which I'm ok with whatever she wants to say about me I honestly don't care but don't speak about my family when you have NEVER taken the time to meet them or get to know them even when my family has tried ! , and yes he defends me and always has my side but it just bothers me so much that when she sees me she acts like she loves me and I'm the " best thing that has ever happened to her son " ( her words ) my family has been supportive 100% since we told them about the baby , the have gone over the top buying the baby clothes toys the crib stroller car seat and so much more ... And his mother not ONE thing not a shift not a bib not toy NOTHING . Every time we have tried showing her the ultrasound pictures all she says is " aww it looks deformed " or " what's that it still looks like nothing " lmao honestly it just makes me laugh how ignorant she can be , I'm trying my best to involve her but I can't deal with her anymore ! And mind you I'm not one to expect for ANYONE to give my child anything and i don't expect it either but it's just her actions that are really getting to me and her stupid comments ! I haven't spoken to her for about a week now simply because she got upset my boyfriend gave me money in front her to pay for our cell phone bills and she threw a fit that because " why are you giving her money for her bills and not me " mind you he is the only son that helps her ! So that bothered me obviously but I acted like the bigger person got my purse and right when was gonna walk out that my boyfriend came up behind me she followed him with a freaking broom to " hit " him because he was horrible son and I guess she missed and hit me... Well that didn't go well my boyfriend got so mad and pushed her and screamed at her that is she ever layed anything on " his girl " ( me ) again she would regret it the rest of her life .... So she started screaming and making a show so of course the other brothers came to see what was happening and tried " fighting my boyfriend " because she was screaming saying he Almost killed her .. with me in the middle of everything it turned in to a huge mess and I just left I have no need to be in the middle of all this crap specially while pregnant ! My boyfriend came after me and we just left to my mothers house . NOW what I'm pissed and bothered about is she is posting pictures of my babies ultrasounds captioning them " welcoming my first grandson "  " so excited to be a grandma " " can't wait to hold my grandson " ..... I haven't posted NOT one picture of my baby on any social media just because I simply don't want to and had told her and my family to not do that either  ... Of course guess who did it after I stopped speaking to her ! I mean seriously at this point I don't want her or his brothers anywhere near my child EVER ! And my boyfriend is actually ok with that . Or am I over reacting ? They are crazy ! 
... I don't live in that house thankfully , I am back with my mother and my boyfriend is staying here until we can leave , which our plan is to be out on our own by March .