@mikayler How old are the Corelle dishes you are using?
Unless you habitually leave food sitting on high-lead surfaces for a long time before consuming, chances are, even with lead in the finish, very little leaches into your food.
But, if you are concerned, here are ways to test:
There are home test kits (choose one suitable for ceramic surfaces, not paint and drywall.)
You can have the serum lead levels in your blood checked.

Some years ago we acquired kitchenware from a foreign source, and were concerned about it possibly containing lead, so we tested it (it was safe.) Since we had a whole pack of swabs we also checked older dishes and serving pieces - at most only a trace of lead was found - on antique, hand-painted china on the outside of the coffee server. We also found lead in a few antique cut-glass bowls, so we only use them for decoration or for wrapped candy now.