Mine has been irregular as well, I've really only had one since having Ava.
I was hoping that I would not get another for a WHILE, but I'm like Chantal, one of the unlucky ones. :) BUT, I could sure tell when it was coming last time! The cramps where horrid!
It will probably be irregular for a little while yet. I have gotten my period 4 times since I gave birth (my little boy will be 5 months tomorrow) and this is the first month that it's on time. What exactly are you experiencing? I thought most women didn't get their period while breastfeeding and thought I would get lucky...guess I was wrong! At least I'm not the only one! =)