5 positive OPKs???

Okay, I was under the impression that you would get a positive opk for one day, maybe two. However, today was my 5th day in a row having a positive opk. And yes, I'm sure they're positive. The test line has been noticeably darker than the control line every day. I thought OPKs were supposed to measure LH which surges 12-36 hours before ovulation. How am I going on five days of surge? What does this mean and how am I supposed to know when I ovulated or if I even have yet? (According to Glow, my window has already passed, but I realize that window isn't 100% accurate.) Thanks!