First trimester screening???

Everyone is posting about harmony tests or whichever ones test for downs and all that but can also tell you the sex of the baby... how did you know what kind of 1st trimester screening it was? Only asking because my OBGYN'S office only says "first trimester screening" no brand name or anything like that... I'd really like to know the sex of the baby but I fear my doctors office doesn't offer the test that can tell you that. How did you guys find out what kind of test it was or did you request to have the gender tested in the blood also?