Do you have space for the queen to lay?
You will have queen "cups" all the time they are about 1/4th the size of a grown cell. they are ready in case there is a need for them.
They don't make a queen cell just to be making one. Either they swarm or replace the old queen, or raise an emergency queen if needed. As long as you have open brood,"not capped" I would wait on adding a new queen. If they are in the first stages of rearing a new queen they will not accept another queen.
I don't know about all these claims of having laying workers so early after a queen is gone. not saying you have that, I once had a colony that was queen less for 42 days, no laying workers, they took the new queen readily.