And there is always the possibility you missed your window to see a +OPK. Some women build up to a dark + and may even get 2 days of a really dark result line where it's tricky to figure out which to mark as the +. Some women may only get 1 +opk at all and it may be tricky to catch.... Like they may take 2 a day and it may be a negative result in the AM and a positive result in the PM and back to a negative result the next morning.

When are you taking your OPK's and how frequently are you testing?

Either way, I think charting will only help you out

Good luck this cy

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