Fertility Awareness?

[xxThe_Lebowskixx]

I have hard time reading medical stuff without feeling queezy. I've been trying to get through this http://en.wikipedia.org/wiki/Fertility_awareness for a few days now. The goal is to avoid pregnancy.

This website http://www.beautyandlace.com.au/fertile.htm mentions:

"Now days, there are ovulation tests available which clearly determine when a woman’s fertile period is. These tests are based on measuring levels of LH (Luteinizing Hormone) in the woman’s blood. A surge of LH is a key indicator that ovulation is about to occur, usually within 12 – 48 hours. Once the surge is detected, intercourse over the next day or two has the most chance of resulting in conception.

"LH detecting kits have been available in the USA for some time, but are newer and generally more expensive in Australia. Simple, urine based LH tests can now be obtained in Australia."

Are these tests 100% effective?

Something else mentioned is http://en.wikipedia.org/wiki/Basal_body_temperature

From which part of the body are you supposed to take the temperature every morning? Again, how effective?