If the sighting was here in the U.S. this time of year, I'd be concerned that it's not a Lady Bug (as their known here) but, rather an Asian Lady Beetle that looks very similar, but swarm and tries to enter the house thorugh cracks and crevices to hibernate... which Lady Bugs do not... bad news... one site describes them thusly:
•Until the 1960′s there were no Lady Beetles in the United States, they were brought in as a way of controlling agricultural pests that eat things such as pecans and apples.
•As a defense against predators the Lady Beetles secrete a foul smelling, yellow fluid from their leg joints. Humans would most likely only smell this fluid when there are swarms of the Lady Beetles secreting it at once.
•Lady Beetles are attracted to illuminated surfaces such as the side of a house which is in the sun. They also are attracted to lighter colored house trim or the gutters of a home.
•They do not reproduce once they find a home for the winter (that’s a relief). The Lady Beetles you may see leaving your home in the Spring are the same little suckers which found their way in, in the Fall.
They are especially prevalent if the nearby farmers are raising soy beans...