Easy way to test this is to unclip one foot and pedal with the other. You'll find out real quickly if you're pulling up on the stroke. Do this for both legs.

I'll never go back to platforms. At first I too was like, what's the big hoopla about clipless it doesn't seem any faster and now I have the added burden of making sure I clip out.

But now that i've gotten used to them, I can push/pull the entire circle uphill, downhill, on flats without every worrying about my foot placement...!

Bonus is you can never slip off the pedals, i.e if it's wet.