01 · Overview
The short version
Fertility involves both partners
Pregnancy can be delayed by ovulation problems, sperm issues, blocked tubes, uterine conditions, or more than one factor at once.
The usual timeframes are different by age
Infertility is generally defined after 12 months of regular unprotected sex for people under 35, and after 6 months for people 35 or older.
Irregular periods are a useful clue
Very irregular or absent periods can point to ovulation problems, including PCOS or another hormone imbalance.
Treatment is not always IVF
Care may start with treating a hormone problem, checking the semen, or using medicines; assisted reproductive technology is one option, not the only one.
02 · Care guidance
When to get help
Emergency help
- Get urgent emergency care now if you might be pregnant and have one-sided pelvic pain, shoulder pain, fainting, or heavy bleeding, because these can be signs of ectopic pregnancy.
- Call 911 or local emergency services for sudden severe chest pain, trouble breathing, severe allergic reaction, or other signs of immediate danger.
Get advice promptly
- Contact a clinician soon if you are under 35 and have not conceived after 12 months of regular unprotected sex, or if you are 35 or older and have not conceived after 6 months.
- Seek prompt evaluation sooner if you have very irregular periods, no periods, known endometriosis or pelvic inflammatory disease, repeated miscarriage, a history of testicular problems, or concerns about semen quality.
- Also contact a clinician sooner if you have symptoms of a hormone problem such as excess facial hair, new acne, milky nipple discharge, or major weight change.
If you are just starting to plan a pregnancy, a routine preconception visit can help review medications, vaccines, chronic conditions, and cycle timing.
03 · Fertility And Conception
What has to line up for conception to happen
Pregnancy starts with ovulation, sperm reaching the egg, fertilization, and implantation in the uterus.
Fertility is not one single body part or one single test. An egg has to be released, sperm has to reach it, fertilization has to happen, and then the embryo has to implant in the uterus. A problem at any step can make pregnancy slower or less likely.
That is why a fertility check can include both partners even when one person seems to be the only concern. Repeated miscarriage can also be part of a fertility evaluation, because conception and staying pregnant are related but not the same.
- Conception depends on the timing of ovulation and sperm transport.
- Problems can involve the ovaries, sperm, tubes, uterus, or hormones.
- Fertility care may look at pregnancy loss as well as getting pregnant.
04 · Fertility And Conception
The reasons pregnancy may take longer
The most common causes are ovulation problems, sperm problems, blocked tubes, uterine conditions, and age-related changes.
In people with ovaries, one of the most common reasons for trouble conceiving is not ovulating regularly. PCOS is a common cause, but not the only one. Blocked or damaged fallopian tubes can also stop sperm and egg from meeting, often after past STIs, pelvic inflammatory disease, or abdominal surgery.
The uterus can also play a role. Fibroids and endometriosis are examples of uterine or pelvic conditions that may interfere with conception or pregnancy. In people with testes, low sperm count, sperm that do not move well, blocked sperm ducts, and hormone imbalances are common reasons for infertility.
Age matters too. Egg problems may occur with aging, and fertility generally declines over time. Lifestyle habits such as smoking, heavy alcohol use, and being very overweight or underweight can add to the problem, but they are not the whole explanation for everyone.
- Irregular periods often point toward ovulation problems.
- Past infection or surgery can affect the fallopian tubes.
- A semen test is a common way to check a male factor.
05 · Fertility And Conception
Why timing can matter even when nothing seems wrong
The fertile window is short, and irregular cycles can make it hard to know when ovulation is happening.
Sperm can survive in the reproductive tract for several days, but the egg is only available for a short time after ovulation. That means conception is most likely when sex happens in the days before and around ovulation. If cycles are regular, that window is easier to predict. If cycles are long, short, or irregular, timing becomes less reliable.
A missed period does not always mean pregnancy, but it should not be brushed off either. Very irregular or absent periods can mean ovulation is not happening on a dependable schedule, which is one reason clinicians ask detailed questions about cycle length, flow, and symptoms.
- Regular cycles make ovulation timing easier to estimate.
- Very irregular or absent periods can signal ovulation problems.
- Tracking periods can help a clinician see patterns.
06 · Fertility And Conception
What a fertility workup usually includes
Testing starts with history and exam, then may add blood tests, imaging, and a semen analysis.
A fertility visit usually begins with questions about how long you have been trying, the pattern of your periods, past pregnancies, surgeries, infections, medicines, and general health. That history matters because it points to the most likely causes and keeps testing focused instead of random.
The testing may be different for each partner. Blood tests can look for hormone problems, imaging can check the pelvis or uterus, and a semen test can look at sperm count and movement. Depending on the story, a clinician may also think about PCOS, thyroid disease, diabetes, uterine problems, or tubal damage.
A good evaluation is targeted. There is no single panel that answers every fertility question, and the best next tests depend on age, symptoms, and how long pregnancy has been trying.
- Bring your cycle history, past surgeries, and any miscarriage history.
- Ask whether both partners should be evaluated at the same time.
- Testing should match the likely cause, not just one standard panel.
07 · Fertility And Conception
How treatment choices are matched to the cause
Treatment may address a hormone problem, a structural issue, or use assisted reproductive technology if needed.
Treatment depends on what is found. If thyroid disease, a hormone imbalance, or PCOS is part of the problem, care may focus there first. If fibroids, endometriosis, or another structural issue is involved, treatment may be different. Some people are helped by medicines that support ovulation or correct a hormone problem.
If pregnancy still does not happen, assisted reproductive technology may be discussed. ART treats infertility by handling eggs and sperm outside the body and then placing embryos into the uterus. IVF is the most common type. Donor eggs, donor sperm, frozen embryos, or a gestational carrier may also be part of care in some situations.
One common concern with ART is multiple pregnancy, which is why limiting the number of embryos transferred matters.
- Not all fertility care is IVF.
- The right treatment depends on the cause and the age of the person trying to conceive.
- Multiple pregnancy is a known complication of ART.
08 · Fertility And Conception
Why PCOS often comes up in fertility visits
PCOS can cause irregular ovulation, acne, extra facial or body hair, and sometimes weight gain or darkened skin patches.
PCOS is one of the most common causes of infertility because it can stop ovulation from happening on a regular schedule. Some people notice irregular or missed periods first. Others notice acne, extra facial hair, oily skin, weight gain, or darkened skin patches.
PCOS is also linked with insulin resistance and can raise the risk of diabetes and endometrial thickening, so the discussion is not only about pregnancy. That is why care often includes cycle management, fertility planning, and longer-term follow-up.
- PCOS can be present even if not all symptoms are obvious.
- Many people with PCOS can still get pregnant.
- PCOS care may include both fertility and general health follow-up.
09 · FAQ
Questions people ask
Do both partners need testing?
Often, yes. Fertility depends on egg and sperm factors, so checking both partners can save time and point to the right treatment sooner. A semen analysis is a common part of the workup, and it can be useful even when the cause seems to be on one side only.
What if no clear cause is found?
That can happen. Infertility sometimes has no obvious explanation after the first round of testing. Even then, the evaluation is still useful because it rules out some problems and helps guide next steps based on age, cycle pattern, and how long you have been trying.
Can lifestyle changes help at all?
They can help overall reproductive health, especially quitting smoking, avoiding heavy alcohol use, and reaching a healthier weight if needed. Those changes do not fix every fertility problem, though, so they should not replace evaluation if pregnancy is not happening.
Are vitamins or supplements enough to improve fertility?
Usually not. Supplements are not a substitute for finding and treating an underlying cause. A prenatal vitamin may be recommended before pregnancy, but claims that a specific supplement can fix fertility should be treated carefully unless a clinician has a clear reason to use it.
How long should we keep trying before getting checked?
If you are under 35, the usual point for evaluation is after 12 months of regular unprotected sex. If you are 35 or older, the usual point is after 6 months. You should be checked sooner if you have irregular periods, prior pelvic infection, repeated miscarriage, or known fertility risk factors.
When is this urgent instead of routine?
It is urgent if you might be pregnant and have one-sided pelvic pain, shoulder pain, fainting, or heavy bleeding, because ectopic pregnancy is possible. Severe chest pain, trouble breathing, or a severe allergic reaction also need emergency help right away. Those symptoms should not wait for a fertility appointment.
10 · References
References and supporting evidence
These sources support the points identified below. Source checking is not clinical approval.
- S1: Assisted Reproductive TechnologyMedlinePlus / U.S. National Library of Medicine
Explains what ART is, that it is a treatment for infertility, and that it involves handling eggs and sperm.
- S2: InfertilityMedlinePlus / U.S. National Library of Medicine
Explains the usual timeframes for infertility evaluation and the basic definition used in the article.
- S3: Polycystic Ovary SyndromeMedlinePlus / U.S. National Library of Medicine
Explains that PCOS commonly involves not ovulating regularly, which is relevant to irregular periods and conception difficulty.
General information, not a diagnosis. This guide is not a substitute for care from a qualified healthcare professional. For an emergency, call 911 in the US or your local emergency number. Illustrations are conceptual and are not diagnostic images.