They range in color from almost white to brown, but they turn rusty red after feeding. The common bedbug doesn't grow much longer than 0.2 inches (0.5 centimeters) and can be seen by the naked eye
Not an expert myself but I think the experts will tell you normally bed bugs are *not* gray-colored but color can be highly subjective and also the blood you saw can be highly subjective as to whether it may really have been some sort of fluid from the arthropod itself or from something it might have been eating that wasn't blood.
An adult bed bug can be up to: 3-7 mm in size. It's reddish or brownish in color. They have a tendency to leave bloodshed took from our body on the bedsheets, along with the edges of furniture, inside walls and their cracks.
Bed bugs are usually a brownish red color, but are usually white when they are first born, and can also appear red when they have recently had a blood meal. Gross, huh? What color is bed bugs?
Bed Bug Color. Unfed adults bed bugs are mahogany to rusty brown color. Engorged bed bugs are red-brown color after a blood meal. Nymphs (baby bed bugs) are nearly colorless when they first hatch and become brownish as they mature. Count of Legs. Six legs. Bed Bug Shape. Unfed bed bugs are flat and broad-oval. Fed bed bugs become swollen and more elongated.
They are usually a translucent or whitish-yellow in color unless they have recently fed and then they are a red color. In general, adult bed bugs are about the size of an apple seed or a grain of rice and nymphs are smaller. They are very prolific and a female bed bug can lay approximately five eggs in 1 day and about 500 during her lifetime.