Hello My Fiance And I Would Like To Know When

Hello my fiance and I would like to know when exactly is a woman more likely to get pregnant during the ovulation process what is the window and what are the days the first day of my last cycle was 3rd and the next day of my expected so I go is the 3rd so mine is about 30 days can you please help we just try to be responsible and only have kids when we're ready ?