Emma, I am sorry you're going through this.

I am in the same situation. We were trying for our second child, got pregnant right away and at my scan where I should have been 10 weeks, I was told I was carrying twins but neither had developed past 6 weeks and there was no heartbeat. We were devastated. I was also one who never thought this would happen to me. Yes, naive I know since it is very common and doesn't mean you have anything wrong with you.
When I spoke to my ob/gyn, I was given the 3 options (natural, medical or surgical) and I opted for natural m/c. I have spotted brown on and off since I was 6 weeks 5 days and now I would have been 11 weeks 4 days and still only spotting brown sporadically. No pain, no red blood, no clots. I'm still waiting. According to the scan, my babies didn't develop past 6 weeks so I'd be 5 weeks 4 days out now with nothing more than sporadic brown spotting. I was assured by the hospital and my ob/gyn that there was no significant risk of infection at this time and it was recommended that I wait out this week and then we'd be called to re-evaluate.
Stay strong. PM me if you want to talk.