Different Apps

Keri • MC 15/11/17 💔 MC 27/1/18 💔 🌈 Baby Girl Nov 19 💕

Hi ladies, firstly this is all new to me, first month TTC. I have been tracking on Ovia, Glow and Flo. They were all predicting AF to be due on 26th however I have been entering stats/symptoms daily and now Flo and Ovia have changed to 22nd where as Glow is still showing 26th, would anyone why they would change please? Thank you ✨