??? Ovulation

BeyC • Married 5/23/00 to the love of my life!Mom 2 a 18yr old girl, 11 & 2 boys! TTC since our MC 11/13 & 9/14 Fxx for all. 🌈EDD 7/2019 🎉
Cd 15 here, I don't use OPK's (never had any luck using them) 
¯\_(ツ)_/¯ 
I've noticed 4 consecutive temperature rises since the 11th (everyday). Each rise about .2-.4 increase. I usually O on or around Cd 20/21. Could I have O'd earlier?