Question about OPK'S

G • Just found out we are expecting #2! Best Christmas present EVER!!!
So, I've tried quite a few opk'S, and everyone of them is different as far as the length of time it gives you when you get a positive. Is it different with every test? Or is it the same all around, you ovulate 12-36 hours after a positive? The digital one I have says 24-48 hours after a positive. Which is correct? Thanks, any insight will be helpful.

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