Again, 100% pullets.
It is important for BR owners to train their own eye to see the obvious difference in males/females at two different ages. The first important milestone is 6-8 weeks. Cockerels have 2 barring genes and their bars are bright and white, and at that age, they sprout red...
It is quite likely a cockerel. Pullets do not normally sprout combs or wattles until much closer to maturity. Give it another couple of weeks. If these secondary sex characteristics really grow large and red? You'll know for sure.
One other possible issue is that BSL, or black sex link, males...