pregnant days before AF??

Has anyone ever gotten pregnant days before AF was due to arrive? When I say days like I mean two days before no more than 5 days prior.
Did anyone get their AF still or did it just not come at all?
This is a first and informally get preform the day after my period ends or even weeks after. But never so close before so I'm not sure what to expect when AF is due on Tuesday.
Does someone know?