New to OPK’s! Was it my surge?

So I’m new to using opk tests, this is my first cycle with them. Could the 28th have been my surge? The glow analyzer marked it as still negative but I’m not sure. It seems as if all tests after have been getting lighter... BD’ed on the 1st. Glow predicts my Ovulation as the 5th so I do plan to keep testing until then. Just looking for other opinions and experiences! Thanks ladies

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