Is my O window over?

This is my first time TTC.  I bought the test strips online and have been using them.  I just came off of the Nuva Ring January 26.  I had a 24 hour AF and per that... I sould have started to O around the 10th of Feb. well... All test were negativ so I figured this month was a wash and had stopped using the strips.  Yesterday I just happen to use one and BAM! A positive.... I then tested yesterday in the late evening and the line was much lighter.  Then tested again this morning (FMU even though I know that's a no-no) and that was even lighter. We did BD yesterday mid day, so I am hoping if didn't miss my O 😕 anyone have any thoughts??