I am an Iraqi veteran and have PTSD and live in a crappy neighborhood so I sleep with a gun in my bed. I had a prospective girl over and she found the gun under my pillow. she didn't seem freaked out by it at the time. but I haven't heard from her in about a week.
from the looks of it yes. she might think you're dangerous. call her up and explain why you have one and maybe you can shift it from under your pillow to under your bed next time. its dangerous sleeping with a gun under your pillow bro