Positive?

Good evening ladies! Just took 3 pregnancy tests. First one I took right after work and was a pretty solid line. Got pretty excited so I chugged some water and took two more tests. The second one was lighter but still there and the third on seems nonexistent. 
So the question is: can drinking a lot of water cause the positive to go away or do you think the first two were false positives? Thanks for your input!