When I was pregnant with DD, I had a HUGE SCH. I had a lot of spotting, brown and then red. The SCH was about 80%, if you can imagine. The only place that wasn't hematoma was right where the baby had implanted. On the ultrasound, it looked like a deflated balloon. It resolved itself pretty quickly, although I had spotting through week 14 or 16 or so.
When I was pregnant with DS, I had not one single spot of blood.
This pregnancy, spotting started at 6 weeks, and I had some earlier this week at 17 weeks. I had a really bad SCH with a rupture that was diagnosed around 11 weeks. I could smell amniotic fluid. It's complicated this time by placenta previa. But the SCH has healed a couple times. Earlier on, a couple times, I had a pink toilet full of clots after a pee. A follow-up u/s should show whether it's getting smaller or bigger. It's a really good sign if it's healing. My rupture healed itself in about a week.