
I am in the same boat you are. When I mc'd in June, the mc lasted 31 days to be followed by AF 21 days later. I am on my 2nd full cycle after mc and on day 28. Hopefully this is my BFP.
I also was like clockwork before mc. It's tough to predict lateness I think after a mc because because the hormones are still all over the place and trying to settle in. Time will tell.
Don't think I was much help. Just wanted you to know that you are not alone in trying to figure this out.
Wishing you a BFP this cycle.