A woman's maximum monthly chance of becoming pregnant after unprotected intercourse is about 30%.
Infertility is diagnosed after 1 year of unsuccessful attempts to become pregnant.
A basic infertility evaluation consists of assessing ovarian function, semen parameters, and tubal status.
If no problems are found, a diagnosis of unexplained infertility is made. In such cases, the likelihood of becoming pregnant during subsequent months is, at best, only a few percent.
Further attempts to achieve pregnancy can be successful, however, so expectant management still has a role.