Ovulation day confusion

Renae • 💙 '09....💙 '11....💔 '14.... 💔 '14....💔 '15....💔 '16....💔 '17....💜 12/12/17
I was looking at my fertile days and I'm abit confused...I thought I ovulate on the 17th but glow is showing my highest peck is the 16th.....does that mean that's my expected ovulation day?? I brought some first response ovulation strips while I'll b using aswell. I just wanted to get others input!