Here is my first month using OPKs- they just progressed so well! I'm still waiting to see a bigger temp spike to confirm O, though temps have gone up a little the last few days.
I was away from home on the 28th, and I didn't want to transport home peed on sticks. They were really faded- I was convinced I had missed O even though the previous sticks were def getting darker. Turns out the 3rd birthday party stress pushed my schedule back a few days instead!