Confused on glow schedual??

My glow app notifications told me today that it was my peak fertility day, but inthe calendar for next week it has my fertility going up all week to 33%on Thursday and back down to 22%on Friday. So is my app messed up? I just ended my period last Wednesday and it was nearly a week late according to glow schedual? I am very confused and if I am reaching peak fertility next week I will need to be careful.