Woah 😀

I took an opk a few hours ago and it wasn't all that dark. Then I took one just now at 8:05 and it's much more darker then earlier. Is it normal to go from being super light to dark in just 3 hours??

Should I test again tonight to see if it gets any darker or should I wait until tomorrow to test. Also, when do you think I will get my positive opk.