Infertility means the lack of the ability to conceive despite trying for 12 months, having timed unprotected intercourse. If it is more than one year without success, it is time to seek help.
Additionally, a couple, with no fertility issue, might conceive in the second year of trying; but in case there is any issue… earlier is better. Consult an expert, the condition of infertility should be considered and clarified by a doctor.