I just got my first PP AF a week ago, but won't be trying this month to avoid a due date close to my son's birth day. I think we will actively try next cycle though. I have never charted in my life. What do I need to buy, just a BBT? Where do I get one? I have Taking Charge of Your Fertility but haven't started it yet. Does anyone have a cliffs notes version to share?

I have no clue what I'm doing, since Walter was an oopsie.