Question, kinda confused

Vanessa • 33. UC remission, fibromyalgia and arthritis warrior. Happily Married. Mother to a 10yr old daughter. miscarried baby #2 after 13 mnts of trying..finally pregnant with my rainbow after 5 years of trying.
So af was due yesterday(12-31) still nothing so on my log yesterday I said AF was late so now it says AF is due Sunday? But why? Does that mean I have to wait for Sunday to test