getting pregnant out of fertile window, possible?

Ki
My fertile window ended beginning of the week...hubby and I just did do anything. But this week we are on vacation, and want to have fun, sex. Anyone on here ever get pregnant outside their fertile window? We just started trying recently so hoping being out of fertile window we still have a chance of becoming pregnant. I have been tracking my periods with this app for months now and notice a pattern and I am right on with the schedule on this app