AF after MC

LuLuNew • I have 3 amazing kids 8,5, and 15 months and we are ttc #4!! My husband is in th police academy and about to graduate!
So weird question. I was suppose to to start my AF on August 14, instead miscarried on August 7th. It last for 5-7 days. Would my next period start after my mc 28 days or the 14th? Just not sure when to expect it. And suggestions?