Signs of chemical or miscarriage

Can someone please give me advice I’m not sure what to do. But I’m all most positive one of the two is happening. And if it’s okay I would like to hear other people’s symptoms and how long is lasted. And ect. And should I call my doctor or confirm or should I go to the ER?

I’m having severe cramps and pains

Bleeding is 10x heavier. Going on 3 days and when I have my period it only last 1 day.

I feel sick and like I need to faint

Severe back pains

Foul smell, blood clots and ect.