Hi there. I'm sorry to hear this, I empathise with your frustration, and it must be distressing going through pregnancy with many questions left in the clouds.
I'm currently 7+ months pregnant, and I'm working in the SPED field. I wanna share that the autism is, unfortunately, highly hereditary as it's linked to genetic mutations that run in the family. However, chances that your child may inherit it is higher if mum has it (about 5.4%) as compared to dad (about 1.7%)
This may be a sensitive question, but I wonder if you see traits of ASD in your spouse?
Most importantly, do try to manage your stress. Such circumstances can be distressing for both mum & child, especially since you cannot control/predict the outcome. Do try to shift your focus on the positive possibility that your child will not inherit the mutated genes because mum is trying her best for the baby - mum is eating well, ensuring sufficient vitamin & nutrients (these are factors you can control), mum is still exercising, mum does not have the mutated gene & that the risk is lower, etc.
I know it's hard, and it's much easier said than done.
Melody Tan