It is possible that you have AF, although that would make you pretty unlucky.
Yup everyone said that to me too, lo and behold it was. Exclusively BFing, AF returned 5 weeks post partum. And then at 8weeks, 10 weeks, 13 weeks ... 26 weeks ... and I think I O'ed yesterday so that would make it sometime around 34-35 weeks when she is due.

Sorry hun . Apparently we're in the unlucky 2% but I think it's a load of ol' tosh.