Change in flow..

Cynthia
So, I had an early miscarriage in July. I had a regular period in August , exactly 28 days after my miscarriage. Prior to my brief pregnancy I have always had a regular cycle every 28 days for a duration of 5 days. I have my flow now, it was 3 days late, and I'm now on my seventh day. This has never happened. Any clue as to why?