GLOW IS WRONG ABOUT OVULATION.

Hello ladies, soo glow was spot on about my menstrual cycle , my cycle usually last 6 days. I put all the accurate information in hoping that my ovulation timing would be right and it wasnt. I was supposed to ovulate today but as you can see by the FIRST RESPONSE opk it isnt happening lol... the one I took yesterday was darker than today. Ive been to websites & did their ovulation calculators & some results were different.... just stressful. One calendar said im supposed to ovulate Tomorrow but by the looks of it from the opk thats not accurate either. Has anyone else had this problem??? what do you do?