Your body is going to produce whatever your babies need, ladies. That means that even if you just pumped and you feel empty you'll let down again! It is all about supply and demand. My left side also produced more in the beginning. Once you have nursed for several months the production evens out a bit more assuming you and your baby are not favoring one side.
If you want a freezer stash then pump any excess milk after nursing and anytime you feel engorged or uncomfortable. You won't "run out" of milk for your LO it will just take longer to let down, but your supply will build up to feed your baby. I promise you.