Very early depends on location and year to year conditions of course. Here April weather can be iffy, May has much fewer cold rainy spells.What is the definition of a very early queen?
How do you know you have a well mated queen until you have observed her laying pattern/durability for half a season?
I change my queens 2 times a year one time after almonds after splitting the hive and in early august so the hive would go into winter lots of young bees and use mated queensare you talking about the old queen? If so not really. Though I have to admit I don't keep track of my queens. If they start to fail I just replace them immediately, or rather as soon as possible. Generally speaking though spring queens don't want to swarm.