So, I've been tracking using opks for about a month now. Dec 22 and Jan 13 (yesterday- baby danced 3 times between the 12 and 13) were positive days. Every other test has had atleast a faint line. Yesterday I tested twice (morning and night), and both came out strong positives. I tested this morning (~12 hours later, fmu), and the test side is completely blank! The control line is there, but not even a shadow of a line! I took another test just in case there was something wrong with the first, and same thing! I'm concerned because it was so strong yesterday. Could this mean anything? I'm still having a lot of raw egg white cm. Could my ovulation window have just ended? Wouldn't my LH surge kind of decrease instead of suddenly disappearing?

Thank you in advance!