My mother is making me feel awful

Hey everyone, so I find out the gender of the baby on April 5th and I honestly just want a healthy baby, but I have this constant feeling it's a girl. My mother is completely convinced the baby is a boy and has already bought a bunch of boy stuff (that she wants to only keep at her house) She keeps referring to the baby as "him". She claims that she is psychic and has predicted two of my family members baby genders, both were boys and she she only ever says someone is having a boy! I think it is because she wants a boy herself since I am her only child. She told me that if the ultrasound says girl then it's wrong. She is even making a nursery in her house (she already bought blue paint) even though I told her not to because the baby won't be there that often. I told her that I think it's a girl and she screamed at me that I am wrong. I have people in my family that tell me they won't love the baby if it's a boy and now I have my mom telling me that I HAVE TO BE HAVING ONE. I don't know what to do, I honestly think my mom wants to steal my baby and I feel like crying all the time now :'(

I'm not sure how to even attempt to word this politely, but they all sound freaking mental. Seriously. Especially your mother. I don't even know what to say about the others that refuse to love a boy. I'd try to distance yourself as much as possible from all of them. It's too stressful.