FMU - fluids

I got a positive test on the day of my missed period with FMU yesterday, it was a faint line on a IC

So if I take a test in the evening, around 6, with clear blue or first response, and I’ve had a lot of fluid, 2L of water say, will it still come up as a positive? I don’t want to take the test again if it goes faint or negative etc due to fluid intake or time of day....

Edit : I want to do another test to present to my husband - on clearblue or FR, as an announcement. I know I’m pregnant. But don’t want to waste the test if with my diluted urine it comes up negative