Since 90% of women become pregnant within one year of having unprotected intercourse, you should consider seeking fertility services if it has been a year since you have attempted to conceive but with no success.
Because a woman’s fertility declines naturally as she gets older, couples should consider seeking medical help after six months of trying when the female partner is over age 35. Earlier testing may also be appropriate for women with known medical problems that might affect fertility, such as polycystic ovarian disease or pelvic endometriosis, or women who are attempting to get pregnant through artificial insemination.
It is important that both partners be tested initially to allow assessment of the extent of the fertility problems. 40% of all infertility cases may be attributed to the woman, 40% to the man, in 10% of cases both partners contribute to the problem, and 10% of the time the cause can not be identified and it is unexplained.