Milk supply

My son is 9 weeks old and EBF. I will also pump to stash away a supply for when I return to work. I will be honest, my pumping habits are less than routine. I tend to only do it during extend sleeping or very rarely between feedings. Have not been able to figure out the best time to do it and feed my baby.

I woke up this morning realizing we had slept through the entire night. Baby has been sleeping for almost 9 hours. I decided to pump. I'm slightly concerned with the unequal production. My right side is producing almost twice the amount as the left. Is anyone else having this issue? Is there a way to even it out?