Hi I had a section on the 15th January, and I had my postnatal check yesterday. I bled for 4-5 weeks on and off then a break then another bout of bleeding that was really dark brown which has now stopped. I thought I havent had my period yet but hubby thought my mood has changed quite dramatically, as in more PMS mood rather than pregnancy hormones mood. I had a word with my nurse and she said I probably have had a period however due to having a section my cycles may change to what I am used to as a 'normal' period.
So typically even if you don't realise it you have your period before your postnatal check but everyone is different.