Yep. Mine didn't get darker until I actually ovulated. I have read some people gradually get darker. But mine didn't, it was the very same until the actual day I O'd and then it was blaring dark. So....I wouldn't worry about it. I did test in the morning and mid afternoon. If you are using the cheapie wondfo's, then money won't be a concern

I actually got better lines on those than I did on the expensive ones. GOOD LUCK!!!!!!!