no ovulation after stopping the pill?

Hi all, I've been testing myself for ovulation every day since my period ended and the line never seems to get any darker! I'm already on Day 13 or 14 of my cycle. I had been on the pill for 6 years and just stopped at the end of this July. Has anyone else taken a long time to get a positive ovulation test? I'm worried that maybe I'm not ovulating. Any insight would calm my nerves. Thank you!