told me that in the majority of cases, the father displays similar traits in a milder form. Going by her thoughts, you might want to take a careful look at your DH . Of course, it is completely anecdotal, but it would suggest that something might be happening with the male side. I imagine that those traits in a mild form--ability to focus, etc.--would make one successful in many fields, and therefore an attractive sperm donor.
The first article on Google claims that the risk is double, but then when they control for age there is barely a difference:
The autism risk was less pronounced among younger mothers who took fertility drugs, Lyall added. Among women aged 25 to 34, about 3.1% who had infertility and took fertility drugs had an autistic child, compared to 2.6% of women in that age group who didn't.