I'm pretty sure glow is wrong but I figured I would post for reassurance. My period started on 8/6 and ended on 8/9. According to glow my fertile week is 8/10-8/15. So I'm thinking this has to be wrong. I took an ovulation test this morning and it was negative. I have also been tracking my bbt and there has been no spike. I am also using 2 other apps to compare. With P-tracker my fertile week is 8/14-8/20 and Ovia has my fertile week 8/16-8/21. Should I just assume Glow is wrong and BD and continue to test until I get a surge???