OPK 2h apart, could there be something wrong with test or is the surge that fast?

opk 2h apart, could there be something wrong with test or is the surge that fast?" />

Took an opk when I got home from work @6pm and the entire thing looked kind of faint (both control and test line), took another now @8pm and it was very positive. Could there be something wrong with the tests? I drank a lot of water the hours before the first test and nothing between the first and second.

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