How do I know for sure that I ovulated?

Taylor

How do I know for sure that I ovulated? I have a longer cycle and it isn’t always exactly the same number of days. I’ve been taking the Premom easy @ home ovulation tests to track t/c ratio. But the numbers have spiked twice this cycle, so I’m not sure how accurate those tests are. And I only had one day of noticeable egg white cervical mucus. Any help is appreciated!