TW : miscarriage

Mel

I have really regular periods, my period was 12 days late. But when it started it was just light spotting & then turned to heavy bleeding & a few blood

Clots & I also be having a really

Sore back ( that never happens )

How do I know if it’s a period or a miscarriage? What were your symptoms? I’m just super confused ( I don’t take birth control or anything)