We opted not to do any screenings with either of our pregnancies because the tests are not quite accurate enough at this time (at least not during my last pregnancy 3 years ago).
The number of false positives and false negatives is still pretty high giving many people a false amount of hope or anxiety. My sister is 37 and expecting her 2nd child. She didn't have a choice because she's classified as high risk.
In the end, the extra worry wasn't worth it for us. It wouldn't help us prepare for the challenges if there was a chromosomal disorder, and it didn't guarantee everything was safe.
My one HUGE regret is not banking either kid's cord blood. I didn't think it was necessary at the time. Now, those stem cells may be my only hope for a cure should my cancer choose to return in the future.
Good luck with your decision.