Are these bed bug stains?

Hello all. I spotted a small (I believe to be first stage) bed bug at my work desk two days ago. I will attach that photo below for reference. I checked my bed and all of its crevices last night and didn’t see any. I also washed the bedding and dryed it on super high heat. Now when I was looking again today I found the following stain on my mattress protector and a stain on my fitted sheet (the photos I have included of this stain are a front and back view of the same stain). Are these stains from bed bugs?