Do I have bedbugs in my room?

I have noticed for 2 days now itchy red bite-like bumps on my legs that appear to be in patterns of 3. All signs pointed to bed bugs so I washed all my sheets, pillows and all and put them in the drier for a while, I checked my mattress and as much of my bed as I could. The problem is I have a bunk bed atop a desk so my whole bed is one item. The bites are driving me nuts and I'm very scared! I have been checking my room for signs but I cannot find anything! The bites keep appearing after I wake up and I also washed some clothes. I do not want to brush this off because I am genuinely worried yet my parents think I am nuts and won't believe me. What should I do? Please help!!!!