You don't say where you were observing from. Was it the North of Scotland or the South of France?
If you could only see one object in the sky, then that must have been the brightest object around at the time. You don't say in which direction you saw this solitary light, but if it was in the West, then it was almost certainly the planet Venus.
We are now left with the possible reasons why nothing else was visible at that time, and there are three possibilities:
1) You are in the North of Scotland (or similar) where the sun is still not far below the horizon and it is still twilight. The background light is brighter than any other star or planet in the sky at that time so they cannot be distinguished.
2) You are in a town or city that has a high level of light pollution that swamps any fainter object.
3) There was a thin layer of cloud at medium to high altitude (altostratus or cirrostratus) that had sufficient opacity to obscre everything except the brightest object in the sky at that time.