Chances of Autism

Hi all,
So I'm 10 weeks pregnant and used <a href="">IUI</a> to conceive. Because of this we've had an ultrasound every week since 5 weeks. Now I'm getting freaked out and reading multiple ultrasounds can cause autism and the products we use and everything I mostly eat causes it too! I know there is no known cause for it but all of these things are risk factors. Now I'm totally freaked out. Has anyone gone through early ultrasounds and have a healthy child?