i guess it depends on how far along you were when you had the mc, i guess you could class the 1st bleed of the mc as cd 1 coz apparently you can still get preg an its kind of like a period, but then again you might not get a period for a few weeks afterwards. when i had my mc at 9 weeks, i bled for a week and then had no period for 6 weeks afterwards, coz i then thought i was preg again coz we ttc again a week afterwards but nope lol.