Ovulation Prediction Kit

Hi ladies,

I used a stick from a Dischem ovulation prediction kit and it had two lines (I estimated my ovulation date to be somewhere between yesterday and tomorrow)...

Must I test again today or how does it work? I know the kit said that if you get two lines it means that ovulation might take place within 24 - 36 hours. So does the test give you only one line after ovulation (if I test again tomorrow or so, would it then give me one line only?)

Sorry if the questions sound a bit uninformed, but it is the first time using a OPK and I would like to do it right

Thanks in advance!