Infertility is when a couple can’t get pregnant despite having regular unprotected sex. The common definition is when pregnancy has not occurred after more than a year.
According to the NHS, some 84 percent of couples will conceive naturally within a year if they have regular sex every two or three days. While that percentage may seem high, it still means that one in seven couples may have difficulty conceiving – that’s approximately 3.5 million people in the UK.
There are many potential causes of infertility, and fertility problems can affect either the man or the woman in a couple. But in a quarter of cases it isn’t possible to identify the cause.