Take a good look around the folds in your mattress, If you have a mattress with the buttons on top sowed in take a look under all of those, if you have a headboard I'd take a good look around that, they tend to be in all the cracks and crevices, you'd be best off getting a professional out as you won't get the right pesticide to do it yourself. Are there blood spots on your sheets/mattresses? This is a good give away for bed bugs, if not, any other pets than the cat?