My AS son was my first pregancy, and I don't think I was any more stressed out than any other first-time mum. I certainly remember being more stressed with my third, and she is a very bright NT. One thing, tho'...and I know the research does not support vaccinations with the rise in Austism, but when my AS son had his first vax's at 6 weeks old, I remember him screaming for about 12 hours solid. His face was bright red and he was inconsoluable. (A pretty cruisey baby until then). It was awful. So much so, that when my second son was born, I did not have him vax'd until later. 
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All it takes for evil to suceed, is for good people to say; "It's a business".