Flock dynamics/egglaying changes with new chicks

I have 6 hens, one of which went broody, and now has 3 little chicks she's
raising. Ever since her going broody, the egglaying of the other 5 hens dropped off a bit....
but then the chicks hatched, and I'm now lucky to get 1 egg every 3 days. And my BCM
has only laid 1 egg in 2 weeks! Is this to be expected when one of the flock has babies?!?!?
Or is this unusual?