Glow made a mistake

Blahh • Don`t know how to delete.
So has this happened to anyone else? Glow expected my period to start on the 19th..that's only after a 22 day cycle! My cycle is usually 29 days. Which means I should have expected to start yesterday..right???  Please give me an answer bc I have been so confused and scared because I didn't realize the mistake until a whole week after the 19th... I thought I was a week late until I done the research and math! And now I really missed my period yesterday! So I don't know what's going on now?