Alternative accomodations

Yes, it is.
Along the Frances, we found there were often private hostels and auburgues that were relatively inexpensive. This is not true in every village, but in many. One might want to consult a good guidebook, either the Confraternity's or Brierley's are my two favorites, to be sure there is a place ahead. But in all honesty, I hope you don't worry too much about it.

Nearly all pilgrims report that when they let go of the reins and trust the Camino and God, all is well.
That is good advice to you, to me, and to all of us.