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It looks like a tick to me and a fully engorged one at that. Do you have a dog ? You need to get it out of the house which I'm sure you have already done.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.1, 0.0
OS grid ref: TQ4446