New research has revealed the one question doctors should be asking women to determine their fertility.

According to scientists from George Mason University, asking women “Have you ever been sexually active for a year or more without using contraception and become pregnant?” is the most effective way of gauging their chances of conceiving.

With the NHS reporting that around one in seven couples may have difficulty conceiving – that’s approximately 3.5 million people in the UK – the research could prove useful to hopeful parents.