mara, hang in there. DS is 22 months old, my cycles returned when he was 15 months old and they are just now looking normal. My first cycle was 56 days long. I ovulated on day 49 and had a 6 day LP. Even if you are ovulating, I understand that nursing tends to shorten your LP. Mine have been 7-8 days long until just this last cycle, and it was finally 13 days long.
I guess this is an anecdotal way of saying that breastfeeding really screws with your cycles and makes charting more difficult, but I think if you keep charting eventually things will start to make sense. YOu didn't mention your temperature, but that was my best signal that I had actually had an ovulatory cycle, I could definately see the thermal shift. The CM is more confusing, for me at least.