positive test but not pregnant?

Justina • dentist Baby Chuck born 10/03👶🏻! 2 angel babies👼🏻👼🏻
Today with FMU, I took a Clearblue digital test and got a positive! ( Or so I thought)...I then went to the doctor to confirm and their urinalysis said negative. I'm so confused! Is it because it's too early and it wasn't FMU or did I get a false positive on the digital? Has this happened to anyone ? I'm at work now so I'll have to wait to take another test either later today or maybe Sunday. 
UPDATE: after multiple positives at home (first response, ept, Walmart) throughout the weekend, I went in for 2 more urinalysis tests. Both times I've had negative results :(. Going at lunch for a blood test and then on Thursday for another blood test to see if my levels are increasing or if I miscarried. So worried!! Has this happened to anyone ??