After a miscarriage

I’m sure I was maybe 3-4 weeks I got 2 positive test then I started with brown spotting and then it went to red and back pains and clots and I just took another test and there was one line with the other very faint my question is should I go to the ER to get checked out or is it okay to just let it pass on it own I wasn’t far Along to get a DR appointment

Fist time experiencing this :/