My odds for delivering a baby with down syndrome is higher than the usual range. What should I do?

There are 2 types of Down syndrome tests. 1. Screening test which will not give you a yes or no but provide you with the probability. Higher or lower. 2. Invasive diagnostic test which has an accuracy of higher than 90%. However, it also has a 0.3% chance of leading to a miscarriage. If you have only done the screening test and your odd is high, you may proceed with a diagnostic testing. I have 2 friends who during the screening tested to have high probability of having a down syndrome baby but further diagnosis shows that babies are healthy with no Down syndrome.