When cycles are less than 28 days...

Does it mean anything if your cycles go from being consistently 26-29 days to being 21-25 days consistently?

I got my period back in April 2019 after having my son. My cycles were irregular until August 2019 when they begain to regulate between 26-29 days each month. In February 2020, I had a 23-day cycle, and March, April, and May have been 22, 25, and 21 days, respectively.

I'm assuming this is nothing to worry about, but I'm wondering if my body is trying to tell me something? I have not been on BC since 2010, so nothing medically interfering as far as I know.

Any thoughts?