Annoying isn't it? I ebf, dd fed at least every 2hrs, no dummy, co-sleeping, no formula etc. At 11wks I said to dh 'I'm sure I'm bloody ovulating you know'. And bang on 2 weeks later my period schlepped up. And did so every 28 days from then on. It was really flipping annoying. The only weird thing was that I had blocked ducts every time I ovulated. I presume it was hormonal...