First my fertile week was July 20-26 w/ next cycle Aug7. Then a couple day ago it changes to fertile week being July17 -23 and next cycle Aug5. Now entered my temp and it changes again saying fertile week is from July22 till today and next cylcle start Aug 10 . Why is this doing this!?! It's confusing,and the 3rd time over the last week, anyone else know why or had this happen to them?