I thought I was supposed to get my peak on CD 15, like I did last month. As a "backup" (because I don't really believe I'm ovulating normally even though everything keeps indicating I am), I started to use OPKs in addition to the fertility monitor. I used the first one on CD 13, and it was totally negative. I used one on CD14, and there was a slightly darker line. I used it again on CD15, and it was lighter again, then on CD16 & CD17, the line was progressively darker, and then on CD 18, I got my first positive. It was just barely positive - the two lines were the same color intensity, but not as thick. I used another one on CD19, and I got a really strong, clear, unquestionable positive.

As I understand it, some people have them fade in slowly, and with others, it is an overnight change. HTH!

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