am i being rude?

so i am 10 weeks pregnant! and this is my first pregnancy, weve been trying for over a year! so it’s super exciting for both my SO and i!! ❤️

but, his mother keeps overstepping her boundaries.

and one thing i don’t feel comfortable with is her coming to our doctors appointments (they vaginally insert the ultrasound thing) and i don’t want anyone but my SO there, and maybe my own mom. but i do not feel comfortable at all with her being there. but my SO says if my mom can go, his should be able to also.. while i understand it’d only be ‘fair’, i don’t feel comfortable with it as stated 100 times before. and she’s calling me rude.

but the whole four years i’ve been w my so, she’s always stepped on my toes, and tried to one up me and acted like he’s her husband and she’s weird. this is one thing i should have control over and the final say.. am i being rude? what am i supposed to say or do?

additionally: she also already made her decision to be in the room when i give birth. which her and i have been arguing ab since i found out i was pregnant. she will not be in the room, and if she keeps it up she won’t be allowed in the hospital to see our child period.