One way to check for bed bugs is with a credit card. Because bed bugs can hide in crevices no wider than a credit card, a credit card with a piece of tape wrapped around it can reach into tiny cracks and crevices and pull out bugs, their exoskeletons, and their eggs. Look closely at your sheets, pillows, blankets, comforters, and any other bedding, inspecting them for tiny red or black dots that could be blood or fecal stains.