Natural miscarriage process?? How long was it and how does it go?

I am on my 4th miscarriage at 8 weeks, but I have never had one start naturally. I’ve always taken the pills to get things going. I have a d&c scheduled for this week, but I’m not sure I’ll make it until then now. I started spotting yesterday and have continued spotting today. Is there like an “active labor” part to natural miscarriages that are this far along with contractions? I always had an “active labor” part for a few hours with contractions when I’d take the pills. If so, when does that start from when you started bleeding?