Help understanding the LH surge

Chelsea • 👦🏽’08>👼🏽’10>🌈👧🏽’11>👶🏽‘19

So everything I’ve read says you probably ovulate 12-36 hours from your LH surge, and LH surge times can vary greatly. If the next day your test line is super light that doesn’t mean anything except that the surge has passed correct? But that you are probably ovulating within that 12-36 hour window?