Bed bugs??

I don’t know if I am being paranoid ( I am extremely afraid of bringing bed bugs home.). I had to stay out of town last night and the first thing I did after checking in was inspect the bedding. I peeled back all the sheets and the mattress cover. I never saw a bed bug or any blood stains on the mattress. The only thing that made me worry is I found two

faded black stains on the seams of the mattress in the corner. The room smelled like mildew and stale cigarette smoke. This was at a Marriott. After that, I checked the box springs and underneath it. I didn’t see anything in the outlets except dirt, and the headboard just had some dude and dirt, didn’t find any bugs. I am home now, washed all my clothes and changed, and sprayed my hard shell suitcase with 91% rubbing alcohol. I have stayed in a hotel room with bed bugs before, and there were bugs castings all over the sheets (it looked like skin peeling from a sun burn), and black stains all over the pillow cases AND bedding. I saw one bug whenever I stayed there. The room smelled like mold and mildew also. This was at a Holiday Inn.

After having that experience, and seeing that black stain last night, I am terrified that I have encountered bed bugs yet again even though I never saw one and didn’t see anything else that was bed bug related. I did see that two years ago there were one or two instances of bed bugs. Am I overreacting ?? Or can a black smudge on that mattress be from something totally unrelated?