How typical is it for your anus to be sore at 39 weeks?

Yes but make sure. Yoru doc examines it at your next visit, as you may have large internal or external hemm that need treatment and if the head is getting down low in your vaginal this will put pressure on the anus, and I strongly rec u do not go past your due date, a recent large study says the ideal time to deliver for the baby is 39-40 weeks, too many bad things can happen to you or the baby once u go past 40 wk.