When using fertility temperature doing and condoms be in adequate birth control method. i'm really against conventional ways but want to be safe...

Condoms every time: are very effective method of birth control and also preventing STD's. But they must be used properly and must be used every single time. No exceptions, no matter what your body temperature shows. Perfect use of condoms each and every time has a failure rate of around 2%. So if you use condoms every time, any temperature monitoring can only affect that remaining 2%.