Ovulation tests

Im so confused by my ovulation tests. Last month I tested from the day after my period ended until I finally got a positive test. There wasn't even a hint of a line until day 16 and a very strong positive on day 17. So this month I waited a few days after my period before I started testing to not using so many tests. Today is cycle day 9 and there is already a pretty dark line on the ovulation test. Not as dark as the control line but darker than the 16th last month. Has anyone ever ovulated soon after their period ended but so late the previous cycle?