Genetic Testing

Hello ladies

So I got the blood test done for the Genetic Testing when I was 16 weeks & my Midwife called this morning and told me that one of the test came back Positive but not to stress bc the test is known for having a High False Positive rate..Im stressing out anyway I can’t help it I go for my 20 week scan in 2 weeks and she said they would be about to give me a 100% yes or no if something is wrong..Has this happen to anybody else??