If you have found a bed bug, chances are there are more. There is a possibility that one lone bug traveled home with you in a suitcase or in your clothing, but it is highly unlikely that you will only have one. Definitely take measures to search for others. I would take all the bedding off the bed and wash in hot water and dry in a hot dryer. You should also vacuum down the entire mattress on all sides and the box spring as well. You may want to look into bed bug sprays and I have heard wrapping things in plastic will also stop an infestation.