OPK and change in OVULATION DATE

Please check this photo out and tell me what you think... Glow said I was set to ovulate 02/07/2019 but then changed mid day to 02/08/19. But I know my body and I swear I had a punch in my left ovary so bad it hurt to laugh, and then after 30 minutes it went away. So I think I dropped an egg yesterday (08).... Look at my 3 OPKS. 2 from (07) and one from (08). Let me know what you think.... I also have MILD CRAMPS in my back on the left side today 07/09/2019.