Ovulation after chemical

Hello there.

I experienced a chemical pregnancy last cycle and am currently on cycle day 10. I received a high fertility flashing smiley on days 8 and 9, but then it showed low fertility on the 10th day. The test strips were darker, though not as dark as the control. I have been testing to monitor the HCG levels go down and track ovulation too.Has anyone had a similar experience? Should I consider that ovulation has occurred, or could it be hormonal fluctuations?