Hi! Welcome to OCDO. I'm guessing you are somewhere in La.
Start here http://www.laopencarry.org/faq.shtml
Except where they tell you it's against the law, it's not against the law or legally posted as "No Guns" - and especially places like MRI machines. Remember, if a private property owner/manager asks you to leave even though there is no "No Guns" posting, leave first and then deal with the issues behind being asked to leave.
Otherwise, "Wear it with pride!"