My MIL totally is convinced I don't care about MY child at all! SIMPLY because I wanted a drink of…

My MIL totally is convinced I don't care about MY child at all! SIMPLY because I wanted a drink of my SOs red bull! She keeps texting him saying she wishes she could vent to him without telling me what she says. I wanted ONE fucking drink and its not like I was even asking for alcohol! I'm 39.5 weeks pregnant and haven't slept in weeks, excuse me for wanting something for myself for once! Yet I'm the bad guy and there's nothing I can do or say because unfortunately I live with her!!!