Ozzie, generally bfing will stop ovulation for the first 6 months as long as you are bfing exculsively (ie no ff or solids), are feeding at least once in the night, and AF hasn't appeared. After that ovulation will restart at some point, this can be sooner for some women, later for others.

By the sounds of it, you are having AF already, so most likely are Ovulating. Bfing or not, it is entirely possible for you to fall pg in this case. I have not heard that the bfing hormones prevent implantation before - not to say that it's not true, but I don't think that's a common issue. I know several people who have fallen pg while bfing - myself included. Jack was 11 months when Tom was conceived after just 3 irregular cycles (with Jack we were TTC for a lot longer than that and I wasn't bfing!). So I would hang in there. The chances are it won't be too much longer for you.