OPK question

I’m new to this whole ttc journey using the opk’s! I just recently decided this month that I would like to add another child to the family tree. As I already have 2 children, ages 7&2, soon to be 8&3! Today is my 2nd day testing. I know they say that if an opk is positive that the control line has to be as dark as or darker than the test line. I have 2 different apps that show that I’m ovulating on different days. And my cycles are pretty irregular. This is what my test looked like today. It was taken within the 10 minute window. Is it possible that I have missed my fertile window or should I continue testing? Or do opk show negative after the surge drops?