Help! Ovulation Confusion! 😩

Jaime • B/G Twins due July 2018! ⚾️🎀
Hi ladies! 8 months ttc and am struggling to detect ovulation each month.  Cycle day 18.  Clear blue fertility monitor has detected high for the last 4 days, but clear blue advanced gave me a low this morning (first time trying these.). Then, I took a wondfo and it's looks positive!! I'm so confused... Low, High, and Positive all at once?