Unrequested find my iphone alert

At 1655 today, my phone gave a loud alarm, and I got a notification of a find my phone alert.

I also received a e-mail to say my phone had played a sound.

2 factor is turned on

share my location is always off

i have family sharing, but, see above paragraph.

i don’t have any other devices on my account.

i didn’t receive any other notifications at any point.

i logged into my iCloud and changed password straight away.

this is sounding a bit too shady for my liking.

wozzon?