Not ovulating?

Taj★★★ • ❤️❤️
So I recently started using opk because I wasn't getting pregnant by just having sex. I've been taking the test everyday this week and everyday the line got darker but never the same shade as the control. Today I took it again and there was no test line at all I took it 3 times and they all said the same thing. I'm confused does that mean I didn't ovulate at all?