Thanks, sensfan and Emily!
She did it all day yesterday...every feeding and seemed fine. She did, however, wake up at 2:45 to eat, when she has normally been waking between 4 and 5. She has continued with this same nursing pattern so far today as well. I definitely hear her gulping, and when she is done the 2nd breast, she is DONE. She smiles up at me and wiggles all around. It's almost as if she is hurrying up to eat so she can play. It does worry me that she was up earlier in the night, but diapers have still been ok.