Tracking on glow

So hlow show i was fertile the week of july 6-9th i had sex he finished in me 2 times. My cm also went along with me ovulating that week. I am 2 weeks late and have been putting that in on here. I also took 2 test that both came bavk negative. Just looking back at last month and glow changed my fertile week to the following week after what it was originally. The only thing im unsure about is that my cm showed me being fertile july 6-9th not the week after. What does that mean? Im thinking it changed because i have been putting in missed period but im not sure.