Late Ovulation 2 months in a row


Just wondering if anyone has experienced this.

My cycles have been pretty much the normal 26-28 days for the last 8 months with ovulation occurring around day 11-13.

However last month I ovulated on day 21 but still got my period on day 28.

Again this month ovulation occurred on day 21. Just waiting to see about AF.

Is this something to be concerned about as it’s happened 2 months in a row?