Down Syndrome screening

I am currently at week 8 of my pregnancy and need to decide whether want to do Down Syndrome screening during the next gynae appt. I am 30 years old. Understand that below 35 consider low risk, and some mummies will not opt for the screening. Still not sure whether I want to do it? If yes, should I go for Oscar or other more precise and expensive one? Need some advices from those who have gone through this stage. #1stimemom #advicepls #pregnancy