LH surge before AF?

There’s this theory that “you can detect HCG on a OPK”, but there’s also research that shows women have LH surges before AF which can also be what’s causing your line to darken.

If you have tested this theory do you see your line getting darker before AF or only when you got a BFP following?

I’m just curious 🤷🏻‍♀️

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