Genetic testing, who did it, who didn't?

rebecca • I'm 35, this will be my 4th natural child and i have 2 steps. my hub and i are building a few tiny homes on five acres. life in the woods is amazing!
This is my fourth natural birth and sixth child total, I have never done the testing before and declined it again last appointment. I am 35 now though and am wondering if I should do it.