It sound fine to me. Sometimes there are clots or something that blocks the cervix. Also, if you were given antibiotics after the mc for infection, that would have slowed the bleeding also. I mc on 03/01 and bled for almost six weeks. My praters are with you for your loss, and I hope next time will go perfect.
Sorry to hear about your loss, I too had a mc a few weeks ago and got my AF on the 20th of june lasted only three days but as it started it was just like you I would only see something when I wiped... a few days later there she was but NOT in full flow very little.... so dont worry take it easy and start counting for your next O day as it will come sooner than you think.....Your next big chance.......so good luck to you and take care.