Instant Negative

Courtney
Okay so I took a test today - I didn't think I was pregnant, but my two friends who have had babies already made me start doubting myself. I've had an abnormally light and early period the past two times, and this period that just started today is two weeks early! So, they convinced me to take a test to see if I'm pregnant.
The test came up negative. It said to wait for 3 minutes, but it was negative. Does it mean that no, I'm not pregnant or can it be defective? I've never had a test come up instantly before. It's not a digital test.