Don't worry about someone calling the cops. It's YOUR right! Either carry in the open or get a permit and carry conealed.
Let me clarify. First, I am not some wacko who 'accidentally' shows someone their gun. I would rather not have the attention. If ever questioned by the police, I would be very courteous and never have an attitude. I would respect the police officer's demands.
You DO have the right to carry. If this ever happens, be courteous and never give anyone the opportunity to accuse you.
Other than that, don't worry about it. Practice what you might say.
If the cop demands your weapon for them to run it, give it to him peacefully but under protest. File a complaint afterwards.
I imagine one of us will get 'busted' carrying someday. When that happens, share your experience as to help others know what to expect.
When I get a chance, I will post a video of what happened in NH when the police noticed someone 'open carrying' along the street.