unsupportive family

Layli • I am 21, my SO is a wildland firefighter, we are pregnant with baby #1 and I have 2 gorgeous step kids. I have stage 4 endometriosis and PCOS.
We have been trying for a few months now, and we haven't told anyone. But anytime someone else brings up pregnancy my
Grandmother who is like a mom to me goes as far as to "threaten" my boyfriend. "Don't you dare get her pregnant or you are dead." 
It really hurts