This topic is fascinating to me! My brother (cis, four years older than I am and in his 30s) is autistic, and it is likely that our father was, as well (he passed away, but refused to go to a psychologist because it was a "soft science"... he was a biochemist). I definitely have some "quirks" that could place me on the very mild end of the spectrum, and I've done a lot of counseling and personal development to learn how to successfully navigate the world because of them.
Oh course, there is an added layer of oddity in my story that also makes me go "Hmmm...". It wasn't discovered until I was born (c-section because I was sideways and they couldn't flip me the entire pregnancy), but my mom had a very large, cancerous tumor that was growing just above the uterus. I developed slowly and was several weeks late. Of course we have no way to know for sure, but there's been pondering of just what havoc and hormonal imbalance the cancer caused, and what it meant for my development in utero. It would definitely explain some things!
And another unanswerable question... had I been born with a male body like my brother, would I have the same "level" of autism as he does?
The mysteries of life are fascinating!