How accurate is Clearblue

Liza • 👦🏻 5/5/16 👼 8/13/18 🌈 👶🏻 12/15/19 👧 12/4/2019 (our 🌈 baby came early) 🤰with baby number 3

Anyone ever get a faint line on frer and then get a negative on Clearblue- also does drinking too much water before a test, cause inaccuracy