Would anyone know if when using opk's can the test line gradually become darker to match the control line?
Like day 1 - no line visible at all
day 2 - barely visible line
day 3- definite line there but not as strong as control line
and just slightly increasing until you have the LH surge?
Sorry if this is a silly question but this is what has been happening and i wasn't sure if the LH surge is a sudden thing or a gradual thing that occurs over a few days.
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