Took a clearblue digital pregnancy test this morning with my first pee of the day and it said pregnant, but took one again 2.5 hours later after drinking liquid, and says not pregnant. I would only be 4 weeks, which is early, and I read online and saw that clearblue digits false positives this early would be extremely rare. Is it possible I just don’t have enough hCG the second time since I had fluids?