new to all this..very confused

I bought ovulation tests today, took one, it was negative but my tracker says Friday will be my will be my highest percent chance to conceive. Does that mean sometime tomorrow should be predicted ovulation and test again tomorrow? Or according to the app tracker does the test need to be taken BEFORE the green fertile week window. Tried googling (on the sly from my coworkers) all day but kept getting generic kind of ovulation articles.. my AF is predicted march 11th. Please help 😁