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Sounds like a yucky experience (yucky?).

I would suggest that you get a small dog or cat if you don't already have one. They are really good methods of telling if someone else is in your house when you find it difficult to be sure yourself. Their behavior immediately changes (even Cats), and give you an immediate idea of whether or not you should be worried.
Please keep in mind that this is just one suggested component of various other safety measures.