3 days spotting

Krystal • 👼🏼🌈 Our rainbow baby is on her way! 💕✨

This is weird..on my 7th missed day of period I started spotting. I’ve been spotting for 3 days and it’s brown, usually by now it would be a normal flow. I’ve been on metformin since March and haven’t missed my cycle nor spotted like this. Not sure what that would mean? Could it mean I’m possibly pregnant?