Might have been the space station. It's pretty big and bright. I have an app on my phone that tells me where it's at all the time and when and in which part of the sky it'll be visible and for how long. And it's dead on too. Orbit put it right over my part of the world a few nights least week.
It also describes what's called "iridium flares" that I think are other smaller sattelites. Same thing with them. You see them and they get brighter, brighter, brighter, gone.
You'll generally only see them for a few hours after sunset and a few hours before sunrise. Reason being later at night they're passing behind the earth's shadow.
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