G1 at 26 wks. failed 1 hr gtt-149;. performed a 3hr gtt # 77 160 145 125. but i walked a lot did squats drank some water. could this be false neg?

Negative test: Although you are supposed to be inactive during the test, what you've done doesn't sound very rigorous, so probably wouldn't have effected the result.

No: There's an extremely minimal chance that you could have a false negative 3 hr glucose test. You would have to hydrate yourself with a LARGE amount of water - a quantity that most people would not be able to tolerate drinking. Good news - you are not a gestational diabetic! In the meantime, please continue to keep your OB appointments, eat healthy, and take your vitamins. Congrats, and best wishes!