What kind of bug is this?!?

Okay so I woke up at 2 and I looked at my arm when I got up and have these bites on my arm and I'm freaking out thinking this could be a bed bug because my sisters husband works at the hospital and a few weeks ago he came in contact with a guy who had bed bugs and he does all the time . He took all his clothes off when he got home and washed them but I'm just scared because when  I came back into my room I saw it on my pillow . I hate bugs and I have no idea what is is and I can't even sleep in my own bed now .  The second picture is the bite marks I woke up with