Not exactly sure what this little bird is....after looking through books and a quick google, my best guess is it might be a Least Flycatcher??? At first I thought it could be an Eastern Phoebebut it doesn't look like those either. I'll do some more checking tomorrow to see if I can identify it correctly.
Definitely a Flycatcher, not sure which one. The bill seems a little long for Least, it looks rather broad as well. Alder Flycatcher? So many similar looking birds, good luck figuring out the species.