Welcome to the board!! How old is your little one?
Try to temp, check your CP at the same time everyday... once per day.
Monitor your CM when you visit the bathroom during the day and mark down the most fertile at the end of the day.
Even if you miss temps, pick it up again when you remember or when you can, it can still help you alot more than having none at all. As for BDing, I'm a person who thinks.... if it's before I go to sleep for the night then it's today... if it's after I wake up tmor...it's tmor. Hope that made sense?!