Typically, when pregnancy does not occur after one year (6 months if >35 years of age), menses are irregular, or there is a known fertility concern, then fertility testing is recommended.
The most common cause of female infertility is a problem with ovulation. The most common cause of male infertility is a problem with sperm cells and how they function. Other factors that may affect fertility include age, lifestyle, and health conditions. Sometimes no cause of infertility is found.