Nervous to find out gender, anyone else?

Jess
My husband and I find out the gender on Wednesday, January 4th. I am terrified they are going to tell me it's a boy. I desperately want a girl. We have had fertility issues(on my end) as I have kidney disease that has resulted in 2 miscarriages. After we found out that my chances of carrying anynpregnancy to term, we decided to adopt. We now have an adopted daughter. 
The reason I'm terrified of it's a boy is because my husband has a son from a previous relationship that is psychotic. He has tried killing our daughter on multiple occasions to where we have had to cut their contact completely. He had an episode last year when he was visiting for Memorial Day and attacked me. It caused me to miscarry twins (including this miscarriage, I've had a total of 3). We've tried all types of therapy, doctors, activities but nothing helps. My husband wanted to put him on medication but since he is not the custodial parent, he doesn't get the final say. Needless-to-say, I cut my contact with the child as well after another incident. Now my husband goes and visits him but my daughter and I don't. Sad to say but I'm terrified of his son and ex (his ex is psychotic as well). ADHD runs in both our genes on the boys end. My brother was aggressive with me as a child(he is not anymore. He's a big teddy bear to my daughter). 
Basically, nothing has gone wrong for the female genes on either of our families but for the male genes, there's aggression, ADHD, autism and psychotic behavior. I know one can raise a child to be loving but it scares me to death because my mother was extremely loving and my father was present but absent. I've always seen myself having a girl and anytime I think it's a boy I start crying to the point I hyperventilate. I will love my child either way but I'm praying so hard for a healthy princess. 
Anyone else have this issue?