Female Infertility More Condition_symptoms What Are Some Causes Of Infertility (in A Female)?

What are some causes of infertility (in a female)? - female infertility more condition_symptoms

Ok first I would just like to say that I'm only 19 years and do not intend to become pregnant for at least 5 years. However, a friend of the family (in the years of the thirties) has determined that it is sterile and tried almost all options and is very depressed about it. Well, I'm afraid that would be sterile. I know I should not worry about that now, but wanted to know what causes them, and if there is anything I can do about it (if applicable).
Additionally, I was in BC pills one years and am preparing to take before I married (years) can be obtained, I wonder if it is the effect?

And it is a test to see a woman, whether fertile can cause, while the other in British Columbia?

Thanks