I don't know about changing your cycle with that first little gush of blood...
But I just wanted to let you know that I know exactly how you feel! I had my first post m/c AF 5 weeks after my D&C. I was thinking I'd be right back on track as well, but then this cycle was 22 days long...too short...my luteal phase is too short, and I'm starting to get worried.
I just think maybe I'd have been better off if I never starting this charting stuff in the first place. I got pregnant both times before right away with no charting...just letting it happen, and now I'm starting to think I was doing it right, ignorance is bliss!
I'm hoping that maybe after a few cycles my body will regulate again. I have heard from a lot of women that m/c messes you up.
{{HUGS}}