The inability of a couple to conceive even after one year of unprotected intercourse is called infertility. It can be caused either due to a problem with the male or the female partner. Mainly, infertility can be classified into two- Primary Infertility and Secondary Infertility. Couples who have not become pregnant at all are categorized into primary infertility. A couple who have been able to conceive once and unable to conceive again is categorized into secondary infertility.