New to me: Ovulation sticks only tell you that you are 12 to 36 hours before ovulation?!?!

Dee • 42, happy mother of a lovely boy through ICSI on 3rd round. TTC #2 since June 17
Hey Girls, I just received this 'Insight' via Glow and am all 'What the f#!%?':
​-- Did you know?
Ovulation predictor tests work by measuring levels of luteininzing hormone or LH in your urine, which typically increase 12 to 36 hours before ovulation. --
​Now, I was told it would make sense to BD one or two days before ovulation (+ whenever else you feel like it or think it best but definitely 1-2 days before) to make sure not to miss it, and because sperm can easily survive that long in a woman's body. And then I read the insight above wondering if we stopped BDing too early most of the times...?!? Cause honestly, by the time the second line finally appears on the stick BDing is more often a 'have to' than a 'want to'.
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​Did you all know about this?! I'm totally confused....