Could It Mean That Something’s Off? Probably Not
A metallic scent coming off your vag is most common right after you’ve had your period or had some intimate contact with semen. Both can change the pH of the usually-acidic vagina into something more basic (and thus, differently scented). In both cases, the metallic scent should be temporary. If it persists long after your period is gone / despite the fact that you haven’t been near anyone’s Gary Busy any time recently — and especially if it is accompanied by any itching or discharge — check in with your doctor.