Obtaining windows 8.1 update

Ok  seem to have cluttered two questions on one post. So I will post seperatly here if thats cool

as I said I bought a laptop that has windows 8.1 but it does not seem to have version 8.1 update

So not sure how I am suppose to get that 8.1 update version. Stuff I read indicated that it came to the laptop autoatically, but I have been using it about 2 weeks now and it is not on there.

thanks for any help