Hi there,
Some of the women on this board are experts when it comes to conceiving, and I'm no expert, but I know a thing or two! You can still get pregnant, without having had a period. If you don't know when you're ovulating however, it can be trickier than if you have a regular period. So those women who get pregnant right away after having a baby might be having periods, or they might not. I am kind of in the same boat as you. My ds turns 1 on Wednesday (May 7), and dh and I have been trying for a baby for 3 months, after suffering a miscarriage in January. I just got af today, unfortunately so I guess this isn't our month! I breastfeed exclusively as well, but I have also been having a period since he was 4 months old, so it's different for everyone.
I have read that if you try to have longer period of time between feedings for your lo, the more likely you are to ovulate. I would think that once your baby is weaned (or you begin the weaning process), you will begin having regular periods again.
But as far as getting pregnant, yes--it can happen, it just might be harder because you don't know when you're going to release that egg. Good luck!
Whiskers