What are the most effective ways in avoiding miscarriage? Is there anything I can chart or keep a record of to avoid miscarriages?

Not likely. The vast majority of miscarriages are spontaneous, unpredictable, and unavoidable. There is no current means to predict who will miscarry - and no current means to prevent a miscarriage. The few miscarriages that can be prevented are typically due to an incompetent cervix, and the best prevention is early prenatal care with specific surveillance of the cervix and cerclage when indicated.