Well, we are not really trying in using test strips or calendars or anything, but back in September we stopped using b/c and here we are 5 months later and still nothing. I guess I just assumed it would happen instantly, since that's what happened with our 3.5 year old son. No such luck this time. But I feel you - it is VERY unnerving when something that is supposed to be natural and easy just isn't.
Good luck to you on your journey!