How Will I Be Tested for a CYSTIC FIBROSIS CARRIER TEST?What Kinds of TEST Did EVRY1 Have While Being Pregnant

I have a Dr. appt. tomorrow for a cystic fibrosis carrier test, and was wondering how it was down. im 23 weeks pregant and didnt find out til -2 weeks- ago. (sux ive beatin my self up mentally for this) i know ive missed out on tests and other check ups that needed to be done sooner. i was also wondering the kinds of tests others have gone through.
PLEASE I DONT NEED ANY -NEGITIVE- FEEDBACK!!!!!