Negative HPT, CD 39 still no AF.

L • 🧔🏻👩🏽👦🏻🐶
Last AF was 4/19/17. According to Clearblue Digital I had a positive OPK May 12-13. Have taken multiple pregnancy dollar tests and all come out negative! Then the next day they are all positive. Which I know it's an evap line. I've always been regular and started same day every month, but since having 2 chemicals they have been irregular. Anyone know what could be wrong??