My period or something super serious??

So yesterday at work while moving heavy stuff around atleast (60 pounds or more) I started to feel very bad cramping.. I started spotting but only when I wiped for hours.. I NEVER cramp before I get my period nor do I cramp on the first day. Well I wore a panty liner just Incase I started my period in the morning (today) and I woke up to it soaked, so I went to the bathroom and when I sat down blood literally poured out. I feel super nauseous and I took pain meds to make the pain go away that I have but nothing is helping the naseousness. Is that normal to bleed that bad to the point it pours out and should I worry??