I do not ovulate every month. I have only ovulated 2 out of 5 months of testing. I wondered what a fertile month looked like on OPKs. This is what I finally got. My cycle is 35 days (when I ovulate). I took photos each day while tests were fresh. This is a photo of all the tests (dry) side by side from day 7 to 21, testing twice a day. The darkness of the lines on the dry tests are the same as when they were fresh. Hopefully this helps for anyone who is wondering what it looks like. Click on the photo to see the whole picture, the strip with the darkest line is separated from the rest, toward the bottom of the photo.