False positives are not at all uncommon, though any time you get one proceeding with caution is appropriate.
Your best course of action when you get what you believe may be a false positive is to use the website virustotal.com to have the file or link scanned. It's not unusual at all for a couple of odd engines to come back with false positives while the vast majority declare something clean. If you've got between 0 and 10 of about 80 engines saying something is positive, they're probably giving false positives. When something is really malicious a virustotal scan will "light up like a Christmas tree" with engines declaring an infection.
Brian - Windows 10 Pro, 64-Bit, Version 2004, Build 19041
A gentleman is one who never hurts anyone's feelings unintentionally.
~ Oscar Wilde