One site we're finding really useful at the moment is mymonthlycycles.com.
Set out with useful information for all women, it has lots of in depth insight into fertility and products for testing plus reminders you can
set up about your periods, it might be a useful addition to the charting you are doing via ThinkBaby or on your own.
It has reminders about breast health and other menstrual-related issues as well as ovulation and fertility and it's free to sign up.
We're going to give it a go over the next few months so if you check it out too, let us know what you think of it!