Narcissistic Grandma

Bee
So a year ago I found out my mom is narcissistic and now that I'm pregnant (14 weeks) I'm scared to death as to how to go about this. I've planning to do a no contact rule that's suggested in this situation but on the other hand I don't want to be the mom who doesn't let their child see their grandparent but to keep my sanity no contact is the best way. Anyone else dealing with this or know someone who is. I could use some advice