first cycle gains

Hi guys, I have been taking test e 275 renvex labs for 2.5 weeks, pinning twice a week approx 500 a week, I have injected 5 times and I kid you not people are already commenting and I am certainly looking significantly bigger. I am getting really pumped during workouts too. My question is that I didn't think I would see gains til about week 5, certainly not the massive increase already. I am eating like a king and taking arimedex about .5 e3d, could this test e drug be a different drug to what it claims on the label as looking through forums my gains are not the normal for a test e cycle? Any advice would be welcome. Many thanks Andy.

Cheers ninja, I had thought that it could be water but they are looking different to how I did when I did an oral only cycle. My biggest worry at the moment is waking every couple of hours with pins and needles in my little finger so bad it keeps me up, don't have it during the day. Hoping tonight will be different as I am seriously thinking about not pinning tomorrow and abandoning it. I really don't want to do that.