Is my house haunted?

Now here is a strange tale.

I recently moved into a new house, about 2 months ago.

I was sitting in the lounge jsut watching the TV when I heard what sounded like someone coming down the stairs, this was weird as there was no-one else in the house.

Then another day I was in the kitchen and I heard footsteps upstairs, as if someone was in the bathroom, which is above the kitchen, but again there was no one else in the house.

So the question I everyone out there is, has anyone else had a similar experience and do you think my house is haunted?