what time frame is it ok to ovulate?

Im on CD 15 still haven't ovulated but my tests are getting darker! I O'd on CD 13 last month.... is it normal for my ovulation date to fluctuate? 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors