question about implantation bleeding and cramping

Ashley

I started to have super bad cramping today around 2 in the morning. but before that I had, my period, or think it was anyway.. my "period" lasted 4 days. so far today i haven't had any spotting what so ever. my cramping hurt so bad I'd concider it an 8. and made me feel super nauseous to the point i started gagging. should I take a test? I need answers and thoughts!