new accent?

Tonight while leading a discussion group on the agricultural revolutions of both Europe and China I noticed that I was saying a few words differently. Not much, maybe just over pronouncing them? I can't even think of what the words were. Ooh, I think it has something to do with L sounds. Or soft A sounds. Or not. Maybe it's slightly Midwestern? But where would I get that from? I don't even know. It's definitely not Southern. Anyway, just an observation.