It wasn't even 24 hours, but that's a shame. I should've known better than to pin. I really wanted to know my base levels.
Like RogerRabbit said, as soon as you inject, your body starts hydrolyzing the ester so it can be active in circulation. With a 500mg pin I'd expect much higher than 11XX that you got so it probably released enough to raise your levels over baseline but not enough for a true peak reading.