Confused

So I'm 35 regular periods they've never changed had a baby 6 months ago came back like clockwork on the dot, however this month period was due 2 days ago I've had no symptoms or cramps just had small spotting on and off and abut of red and nothing else I'm thinking maybe I never ovulated as never had symptoms for that this month, I've had a nasty chest cough but surely that can't change my period, any ideas, and no pregnancy have had a partner since I was pregnant