Autism and ultrasound connection?

i dont have that many concerns when it comes to ulstrasounds, i love them, i had two miscarriages before this pregnancy and ultrasounds make this pregnancy that much better, i get to see my baby move and its little heart beat! ive had two so far, one to confirm there was only one baby and it was grwoin right at 8 weeks and my 12 week scan which was breath taking! and im having my 20 week scan next week. and will be having a private 4d scan to see my baby in 4d..cannot wait!