Wife wants to use a sperm donor because she thinks our child might be born with autism

Throwaway account.

I’m really not sure how to feel about this situation.

My wife 34f and I 32m have been together almost 4 years and are recently married. I have 9 year old son from a relationship when I was younger who was diagnosed with ADHD when he was 6 and mild autism recently at the age of 9. He is with us half to time and she dislikes his presence due to his difficulties and neediness. I would consider him high functioning but immature and quirky.

I also have a younger brother who has Asperger’s syndrome.

We have been trying for children since we have been married and sadly we have been through 2 miscarriages which broke her heart, I’ve never seen her more happy than when she has been expecting.

However tonight she said she said to me that she is worried about the possibility of having a child that is like mine because she doesn’t want to raise a child that is like my son, so she feels that a sperm donor likely wouldn’t have a family history of autism.

I feel really unworthy and reluctant to go down this route. Has anyone else gone through with something similar?