I'm really sorry for your loss. Lots of miscarriages happen really early but that doesn't make them any less sad. It sounds like you have a really good handle on what's normal for your cycle, so you're probably right about the loss. I doubt that there was anything you could have done or not done to cause your miscarriage. Sometimes (most times actually) you can do everything perfectly and still suffer a miscarriage. Although I'm not a geneticist I believe that in most cases, having only one gene in a genetic mutation doesn't cause problems. I have one gene of the MTHFR mutation and thought it could be problematic for me but that wasn't the case. Hang i there.