Prenatal screening

Has anyone chosen not to do the optional prenatal screening? I am currently 16 weeks pregnant and did not see my Ob until I was 14 weeks and by that time it was already to late to do the screening I was told. And now I am unable to do the second trimester screening as well since I did not get the first trimester screening. I am not worried that anything with be wrong with my baby I am very low risk and fairly healthy person. Just looking to see if there is some type of testing I can do?