Genetic Testing

My doctor wants to do genetic testing tomorrow. I can opt out of it if I please but I am curious about the gender and would be able to find it out early but I also don't want the results to pick up a genetic disorder that the baby has. I don't know if I should do it or not and I really need some advice from all the momma's out there. Did you have genetic testing with your baby and what kind of results did you get? (Also there has never been a genetic disorder in either my family or my husband's.)