Tests fading

So a little over a week ago I had extremely heavy bleeding , before the bleeding and after , I had taken tests that were negative .

About 4 days ago I tested with a test from dollar tree , it was positive . The next day took a clear blue digital , also positive . Today I got another test and took it and it’s almost negative . I can barely see a line on it . I did drink a bunch of tea and im an ice water so I’m always eating ice and constantly peeing . I drank a bunch of fluids I. Hopes to have to go when I got to the house for the test .

Any insight would be appreciated