With 
How long it is reasonable to wait
The NHS says that where the woman is under 40, more than 8 in 10 couples conceive naturally within a year of regular unprotected sex. Even so, around 1 in 7 couples may have difficulty conceiving.
The World Health Organization defines infertility clinically as the failure to achieve a pregnancy after 12 months or more of regular unprotected sex. The WHO estimates that approximately 1 in 6 people of reproductive age experience it at some point in their lives, so you are not alone and it is not unusual.
When to ask for help
The NHS says it is a good idea to see a doctor if you have not conceived after a year of trying. Women aged 36 and over, and anyone who already knows they may have a fertility problem, should go sooner.
In practice, waiting is not always best. If your periods are very irregular, you have severe pain, a history of endometriosis or pelvic infection, or you are simply getting older and want to plan, a first assessment gives you useful information without commitment.
Where everything is
Womb
This is the organ where a pregnancy grows. Its inner lining, the endometrium, is what is shed each month with your period.
Calculate your fertile days
Fertile days: 9 to 14
Ovulation usually happens about 14 days before your next period; the fertile days are the five days before ovulation and the day itself. Making the most of those days increases your chances.
What the data says
Each figure represents a couple or a person. Tap to change the statistic.
8 / 10
Among couples where the woman is under 40, more than 8 in 10 conceive naturally within a year, with regular unprotected sex.
What the causes are
The WHO lists female and male causes. In women: blocked fallopian tubes, disorders of the womb, ovarian disorders such as polycystic ovary syndrome, and hormonal disorders. In men: problems with ejaculation, low or absent sperm, and abnormal sperm shape or movement.
Smoking, excessive alcohol, obesity and exposure to environmental pollutants also play a part. And in some cases no cause is found, something the WHO explicitly acknowledges.
What we investigate at the clinic
Our work-up is straightforward and takes a few visits:
- Assessment of ovarian reserve with a specific ultrasound scan and a simple blood test. It can be done even if you are not trying for a baby in the near future.
- Assessment of the couple, because the cause can lie with either partner.
- Fertile window monitoring, so that attempts coincide with the days when the chances are highest.
- Ovulation induction when it is considered appropriate.
Is it time to book a consultation?
The NHS advises seeking advice after a year of trying, and sooner in some cases.
Have you been trying to conceive for 12 months or more?
This questionnaire offers guidance, not a diagnosis. If the pain is severe or something worries you, book an appointment or seek urgent care.
About the specialist
Dra. Concepción Carrascosa Romero
Reproduction specialist: ovarian reserve assessment, assessment of the infertile couple and ovulation induction.
Frequently asked questions
How many months should I wait before seeing someone?
The NHS advises seeing a doctor after a year without success, and sooner if you are 36 or over or already know there may be a problem.
Can I find out my ovarian reserve without trying for a baby now?
Yes. It is done with an ultrasound scan and a simple blood test, and it helps you plan with information.
Is the problem always with the woman?
No. According to the WHO there are male and female causes, and sometimes none can be identified. That is why the couple is assessed.
Sources consulted
- World Health Organization: Infertility · Checked on October 30, 2026
- NHS: Infertility · Checked on October 30, 2026
This information is educational and does not replace a medical consultation. If you have symptoms, book an appointment with a specialist.
