Possibly. I hope that's the case for you.
Oddly enough, even though I wouldn't say my natural voice is feminine, I've been mam'ed on the phone quite a few times. It's always exciting and jarring because my natural voice doesn't really pass. I guess sometimes when we are in our own zone and talking to strangers we may put off more of a feminine presence. Like we aren't afraid of being judged and just let ourselves go a bit. So, maybe people pick up on things, including voices, when we are more relaxed.
Awesome to hear about the new car!