Short cycles can sometimes be due to a luteal phase defect in cycles. Perhaps your LH is off. I had odd cycles and went to my OB who referred be to my RE.

Mine were fairly off as well after having my son. We TTC anyway and were successful. It was a little hard to calculate ovulation, but with temping and OPKs we were able to do it. I don't know why things got so out of whack.

Ever since I had my son two years ago my cycle haven't been regular. I have been keeping track for the past 4 months and it's 19 days, 34 days, 33days, 19days. Before I had my son I would get my period every 33 days. I don't understand how I could be getting 19 day cycles that is the shortest I have ever had and it just started happening. Something is obviously wrong with me, but I am not sure what. Anyone else dealing with this stuff? I am supposed to start TTCIng in October and getting worried about these cycles.