Hi doctors. is it possible to have signs of bedbugs (rusty color on pillow, brownish-yellow on mattress protector) without getting bitten by them?

Stained sheets: Colors of that sort do not suggest bed bugs at all. More likely related to personal hygiene, bathing, and frequency of laundering the sheets, mattress pad, etc.

Signs of bed bugs:: 1st- blood smears on your bedding that usually turn black over time. 2nd- amber colored “shells” which occurs when the bed bug sheds it's exoskeleton. 3. bug feces on your sheets (brown- black dots). 4. “musty sweet” odor due to bug's secretions. Don't expect to see the eggs. They are is small crevices, translucent and about 1/16th of an inch in length. The adult is 1/4th inch long.