Am I ovulating really early?

I usually have a 32-33 day cycle. I was told that since it's that long that I would most likely ovulate on day 16. Thing is I bought like a dozen opk and started testing the day after my period ended just so I didn't miss it, well it is 10 days since my period and I got a positive on the opk. Which is confusing me. So what I'm really asking is, Can I ovulate this early or should I just test again?