Period math

So my period is on the 21st of every month. Yesterday I missed it, but my husband reminded me that February is a shorter month, so should I be expecting a period on 24th or 25th of this month? No cramping or sore breast or insane cravings followed by the usual homicidal mood swings. I feel pretty normal, just exhausted. Like unimaginably tired. Anyway I got an ovulation kit as well for April, because with my period being thrown off, I don't know when I'll be ovulating either.