Ah, W4W is playing the odds
True, IF you bought it from a big hatchery as a pullet, the odds are very good that it is one. Knock on wood, both Ideal in 2012 and Meyer in 2015 were 100% accurate with mine. I guess those people get pretty good at checking up a newly hatched chick's vent.
If you got it at a local store, well chicks have been known to get mixed up in the bins.

True, IF you bought it from a big hatchery as a pullet, the odds are very good that it is one. Knock on wood, both Ideal in 2012 and Meyer in 2015 were 100% accurate with mine. I guess those people get pretty good at checking up a newly hatched chick's vent.
If you got it at a local store, well chicks have been known to get mixed up in the bins.