Pregnancy tests

Ashli
I took a pregnancy test today, one around 3:30pm, I had been at work all day and hadn't gone to the bathroom since around noon. Then I ate dinner and drank about three glasses of water and took another test. Just mostly for curiosity, but it came back negative this time. Did I dilute my urine too much for this second test to be accurate? I'm not sure what to think right now.