As long as you're not an immediate threat to yourself, I don't imagine anything bad would happen. During a very depressed period I told my doctor about watching a documentary on suicide at the Golden Gate Bridge and how I kept thinking about jumping off a bridge, but that I wasn't about to go do it, and she just talked about it with me and made sure I was safe. She didn't even threaten to hospitalize me. Maybe this is because there is a lot of trust between my pdoc and I. She knows I don't make idle threats and she knows from past experience that I would always tell her if I was in real danger.

With a BPD label, it could be the same, or it could be different. I'm not BPD. Some pdocs don't like to hospitalize people with BPD at all, and some pdocs take every slight suggestion seriously.