How do I know?

I just got 3 Tech Decks today. I think I learned how to ollie, but I'm not sure. This probably sounds weird, but what I mean is that when I ollie, it's so low and so fast, I'm not even sure that I did an ollie, beause the back wheels look kinda low, so they might have not come up all of the way. If you could give me some tips on how to pop it harder or something, that would be great. Please don't leave ugly comments, also. I know this is a weird question!