Drama....‼️🙄

Long story short, I started dating this guy in January. We were living together I’d say like March, he asked me to move in. I did & moved out shortly after his bm was causing us so many problems. Well, May I found out we were expecting. His bm that he has 3 kids with has been picky with me via social media constantly. It’s like she won’t give up, he tells me to chill don’t respond & all that but yet she keeps on. I’m due 01/08, I’ve been ignoring her for a while & it’s like she’s super bothered by me being pregnant. & by the way she’s 29 with 3 kids still living with her mom. It’s like she’ll never stop. I’m trying to focus on me & my son & she just constantly worries about me. What should I do?