Need reminders on charting

ashleesmith2 · June 2014

Hello. I haven't been on the bump for four years since my little one was born. We have just started ttc again and I thought we could just go at it by the calendar only. And this month proved to me why I couldn't (think we missed by O day by two or three days). So, my question is...what's the best resource for getting into charting (again)? And any advice would be appreciated also...
Thank you in advance!