So sorry about your MC, it is utterly horrible.
I had a MC last month (at 7+4) and my AF just arrived yesterday. My normal cycle is 26-28 days. From the first start of bleeding it was 6 weeks, from the full MC, which took a little while to come, it was month, and from the end of bleeding it only took 25 days or so.
I was told to expect AF anytime between 4 and 6 weeks after the end of bleeding. So if I were you I would expect it anytime between now and in three weeks time.
Can you normally tell when you ovulate? Despite my body being a bit off for a while, I could roughly pinpoint when it happened, my AF arrived two weeks later.
I was going mad waiting, being used to relatively cycles where I know what is going on. All in all, it has taken forever and once you know this is over you just want to get on, don't you?
Good luck, AF should come, or even better, not for a good reason in the next week or two.