Should I be able to pass?

[webdox]

I drink a good amount of water.

That doesn't matter. THC is fat soluble. You can't drink and sweat yourself clean. The only time drinking water matters is the day of the test. Your best bet is to do as you plan and test yourself with your first morning pee. Testing yourself in the middle of the evening is of no use.

And yes those THC calculators are garbage. Everybody is different. What might make you dirty for only 3 weeks might make me dirty for 2 months. GL.