Re: TTC while breastfeeding
I think it depends on your body. My cycle didn't return until we were down to one nursing session a day at 12mos, and my SIL's didn't until she had been done completely for a month, but I have friends whose cycles came back while they were still nursing multiple times per day.
I know that one of the milk production hormones prolactin? works to inhibit ovulation, but I'm not sure exactly how. It might help to familiarize yourself with your body's fertility signs (CM, BBT) if you haven't already...you might catch an ovulation before your AF would show up the first time.