Hey Fiona..
I only commented to DH yesterday that this is the first week ive been able not to wear a pad since Jesse was born as ive either had AF or brownish/pinkish coloured CM. I remember my first AF came, then i still had quite heavy CM afterwards, then i got AF in another 2 weeks, then more CM etc etc.. Have you started on any pill? When i started the pill my AF also played up too..Id say its just your body getting back to normal.. but still wouldnt hurt getting your gp to check it out.