Chemical again??

In april I had a chemical. I got a positive and then a few days later started bleeding. Yesterday I got a pretty strong positive.. having had a chemical already I wanted to test again today to see the comparison. Probably shouldn’t , I know. But took it this morning to see only a faint line. The only thing I can chalk it up to is that I did drink quite a bit of water around 4:30 am. But both tests were FMU and like an 8 hour hold... could I get a positive this strong and then the next day it already be fading??