2 Questions!

ALEJANDRA

Q1: When do we ovulate is it the last day of fertiliz days or the following day?

Q2: How many fertiliz days do u have? May sister has been using a diffrent app on heres says she only has 4 fertilize days 5th day ovulates. She only tryed for a month and now shes 8 weeks prego

Im so confused now HELP PLEASE :/