Ovulation strips

Gwen • I`m 29 years old, pregnant with #3 and dealing with adenomyosis and APS
For those of you ladies who test for ovulation, at what point did your surge show? From what I've read, a positive test should show 12-36 hrs before ovulation. But I've seen many pics of tests that have faint lines for days until the positive. I'm supposedly ovulating on Sunday and have been testing for three days, today was the first day I even got a second line and it's sooo faint. Is there still time for a positive to show before Sundayish, or is this a sign that I'm not going to ovulate (my biggest fear right now)? Please help!