Why is it happening now?

Michelle

My daughter is 18months, i started getting my cycle back about 8-9 months PP. Everything was back to normal, some were a lil heavier but always the 4ish days.

But now the past 3 months ive always been about 4-5 days late from calendar calculations. But then my main concern is for the first 2ish days(once it starts) its what Dr. Google is calling "old blood" ??? Why??