what does a miscarriage look like?

dawn • Married ttc 👶🏼 #1 pcos, stage 3 endometriosis, MTHFR
I was two weeks late. I got negative pregnancy test 3 days ago. I woke up this morning to my period. It's lighter than normal and bright red little tissue things in it. My pad did not absorb it.  It normally does with bloods clots.