early ovulation

So I took an ovulation test the very first day of my fertile window there were two lines very close but not positive yet then I took a test for the next two days after and there wasn't even a second line. Does this mean I ovulated the week after my period early? Could it mean I didn't ovulate at all! I was on the depo for 3 years I got off of it April 2016 so I'm concerned that I may not be ovulating at all!