I got AF back when DS was about 8 months old and if he upped the anti on the boobie I'd often miss a cycle, so that would mean I didn't O?

However when he was about 11 months old we "stopped preventing, weren't trying" and I fell pregnant in two months with an erratic AF. Was a shock, took 6 to get DS with hardcore date counting and EWCM tracking and not an erratic AF!