Trying to make sense of my cycles but on a budget so can only purchase one. Which one works best for tracking ovulation?

I have tried easy at home ovulation tests and BBT to predict and confirm ovulation but struggling to conceive. I have long cycles and ovulate late (I think?) My BBT readings are all over the place (yes, I am temping at the same time, with a BBT thermometer, right when I wake up). I struggle with consistent sleep, so wondering if that’s part of the issue with the BBT accuracy.

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