How long does it take to get pregnant? Chances by Age

If you have recently started trying for a baby, you may be wondering whether pregnancy should happen straight away. The short answer is not necessarily.

For many couples, getting pregnant naturally takes several menstrual cycles. Around 85% of couples conceive within one year of regular unprotected sex, but there is no exact timeframe that applies to everyone.

One of the biggest reasons for this variation is age. A woman’s fertility changes throughout her reproductive life, which means that both the chance of conceiving each month and the time it may take to become pregnant change too.

So, what can you realistically expect when trying to conceive at 25, 35 or 40? Let’s look at what the numbers actually mean.

Your chances of getting pregnant by age

Female age is one of the most important factors affecting natural conception.

Fertility is generally at its highest during the 20s and early 30s. It then gradually declines, with a more noticeable change from the mid-30s onwards.

As a general guide:

These figures are population estimates, not personal predictions. Two women of the same age may have very different reproductive circumstances.

If you would like to understand this subject in more depth, read our guide to how a woman’s age affects fertility and the chances of becoming a mother.

Women considering pregnancy later in their reproductive years may also find our article about becoming a mother at 40 useful.

Why doesn’t pregnancy always happen straight away?

Getting the timing right is only one part of conception.

During each menstrual cycle, several biological steps have to happen successfully: an egg must be released, sperm need to reach it, fertilisation must take place and the resulting embryo must develop and implant in the uterus.

There are also only a limited number of days during each cycle when conception can occur.

This helps explain something that can be surprising when you first start trying: even during the most fertile years, most women will not become pregnant during any single menstrual cycle.

Not conceiving during your first, second or even third month of trying is therefore not, by itself, a sign of infertility.

How long does it take most couples to conceive?

Looking at pregnancy over time gives a different picture from looking at a single menstrual cycle.

Published figures suggest that approximately:

• 20% conceive within one month
• 57% within three months
• 72% within six months
• 85% within one year

This is why both questions — “What are my chances this month?” and “How long will it take me to get pregnant?” — need slightly different answers.

Your chance during one cycle may be relatively limited, while your overall chance of conceiving increases as you continue trying over several cycles.

Age, however, remains important. As fertility declines, conception may take longer and there is less time in which to simply continue trying without investigating whether something else may be affecting fertility.

Pregnancy chances in your 20s

The 20s are generally the years of highest female fertility.

For a healthy woman in her 20s, the chance of conceiving naturally during a menstrual cycle can be around 25-30% or sometimes higher when intercourse takes place during the fertile window.

That still means pregnancy is not guaranteed during the first month.

If you are in your 20s and have been having regular unprotected sex for less than a year, taking several months to conceive can be entirely normal unless there is a known reason to suspect a fertility problem.

What changes after 30?

Fertility does not suddenly fall when you turn 30.

During the early 30s, many women still have a good chance of conceiving naturally. However, a gradual decline in both egg number and egg quality is already taking place.

As the 30s progress, age becomes increasingly relevant.

From around 35, this decline becomes more noticeable, which is why fertility specialists recommend waiting less time before seeking advice if pregnancy has not occurred.

What are the chances of getting pregnant at 40?

Natural pregnancy at 40 is absolutely possible, but it is less likely to happen during any particular menstrual cycle than it was at a younger age.

At around 40, the chance of natural conception may be approximately 10% or less per cycle.

The reason is not simply that fewer eggs remain. Egg quality also changes with age, and chromosomal abnormalities become more common. This can make it more difficult to establish an ongoing pregnancy and also contributes to the increased risk of miscarriage with maternal age.

For this reason, if you are 40 or over and would like to become pregnant, we recommend seeking individual fertility advice early rather than spending many months trying before asking for help.

Can you get pregnant naturally at 45?

Yes, but it is important to have realistic expectations.

Natural conception using your own eggs at 45 is uncommon, and spontaneous pregnancies become increasingly rare around the ages of 44-45.

This does not mean that every woman has exactly the same reproductive situation. However, age becomes such an important factor at this stage that an individual fertility assessment is particularly advisable.

What else can affect how quickly you get pregnant?

Age gives us useful information, but it cannot tell us everything about an individual’s fertility.

Conditions affecting the female reproductive system can make natural conception more difficult. If you would like to explore these in more detail, you can read our guide to conditions and diseases that can cause female infertility.

Lifestyle can also play a role. Smoking, weight, alcohol and other factors may affect reproductive health. We discuss these separately in our article about lifestyle habits that can have a negative impact on fertility.

This is why percentages based on age should always be understood as general guidance rather than a way of calculating your individual fertility.

When is the best time to have sex if you’re trying to conceive?

Timing intercourse around ovulation can help maximise the opportunity for conception.

The fertile window includes the days leading up to ovulation and the day around ovulation itself. Because sperm can survive inside the female reproductive tract for several days, you do not need to identify one exact day or moment.

Having regular sex two or three times a week will generally cover the fertile period for many couples.

If you would like to understand ovulation in more detail, read our guide to when ovulation takes place.

For women with irregular menstrual cycles, identifying ovulation can be more difficult.

You can also find practical information in our guide to calculating your fertile days when trying to conceive.

When should you stop waiting and speak to a fertility specialist?

This is where age becomes particularly important.

If the woman is under 35, we generally recommend a fertility assessment after 12 months of regular unprotected sex without pregnancy.

From the age of 35, we recommend seeking advice after 6 months.

From 40 onwards, it is advisable to speak to a fertility specialist when you decide to start trying rather than waiting several months.

There is no need to wait for these time limits if you already know of a factor that may affect fertility, such as very irregular or absent periods, endometriosis, previous pelvic surgery or a known sperm problem.

And remember: having a fertility assessment does not automatically mean having fertility treatment. Sometimes it simply provides information about your reproductive health and helps you decide what to do next.

Can you improve your chances of getting pregnant naturally?

There is no method that can guarantee a natural pregnancy.

However, having regular intercourse during the fertile window, not smoking, limiting alcohol, maintaining a healthy weight and looking after your general health can help create the best possible conditions for conception.

If pregnancy is something you want in the future rather than now, understanding the effect of age on fertility can also help you make informed decisions.

For some women, fertility preservation through egg freezing may be an option worth discussing before age has a greater impact on egg number and quality.

Frequently asked questions about getting pregnant

Is it normal not to get pregnant in the first month?

Yes. Even during the years of highest fertility, most women will not conceive during a single menstrual cycle.

Taking several months to become pregnant can be completely normal.

What are the chances of getting pregnant on the first try?

For a healthy woman in her 20s, the chance of natural conception during one cycle may be approximately 25-30%, although individual circumstances vary.

Is six months a long time to try for a baby?

Not necessarily.

If you are under 35, six months can still fall within the normal timeframe for natural conception.

If you are 35 or over, however, six months without pregnancy is the point at which we recommend speaking to a fertility specialist.

Does it take longer to get pregnant after 35?

It can.

Female fertility declines with age, particularly from the mid-30s onwards, so conception may take longer. This is also why we recommend seeking advice sooner rather than waiting for a full year.

How can I know my personal chances of getting pregnant?

Age-based percentages cannot give you an exact individual answer.

Your reproductive history, ovulation, ovarian reserve, sperm quality and other factors may all be relevant. A fertility assessment can provide a much clearer picture of your particular circumstances.

Does male age affect how long it takes to conceive?

Female age usually has a greater impact on the chances of natural conception, but male fertility matters too.

Age can affect certain aspects of sperm quality, although male reproductive ageing does not follow the same pattern as the decline in egg number and quality seen in women.

Sperm quality itself can also influence how long conception takes, regardless of age.

Rather than looking at age alone, fertility should therefore be considered from the perspective of both partners.

What if pregnancy is taking longer than you expected?

Statistics are useful for understanding fertility, but you are not a percentage.

If you have been trying to conceive and are unsure whether it is time to seek advice, an individual assessment can help you understand your situation rather than relying only on general figures.

At URE Centro Gutenberg, our medical team in Málaga has extensive experience treating both Spanish and international patients.

If you live outside Spain, you do not need to travel to Málaga simply to discuss your case. Your first fertility consultation is free and can be carried out online.

Request your free first consultation.