Infertility is clinically defined as not being able to get pregnant after one year of regular, unprotected sex, or after six months if the woman is over 35. But many people searching this question aren’t at that point yet. They want to know whether their body is already sending signals that something might be off. The answer: there are signs you can watch for, tests you can do at home, and medical evaluations that can give you a clearer picture.
The Timeline That Matters
Up to 15% of couples experience infertility, so it’s more common than most people realize. But “infertility” as a medical diagnosis is tied to specific timelines. If you’re under 35 and have been trying for 12 months without success, that meets the clinical threshold. If you’re over 35, the window shortens to 6 months. For women over 40, doctors recommend an evaluation even sooner.
These timelines exist because conception isn’t efficient even under ideal conditions. A woman in her early to mid-20s has roughly a 25 to 30% chance of getting pregnant in any given cycle. By 40, that drops to about 5% per cycle. So a few months of trying without results isn’t necessarily a red flag, especially if you’re younger. But if you have reason to suspect a problem, you don’t need to wait out the full timeline before seeking answers.
Signs in Women
Your menstrual cycle is the most accessible clue to your fertility. A cycle shorter than 21 days, longer than 35 days, highly irregular, or absent altogether can mean you’re not ovulating. No ovulation means no egg is released, and pregnancy can’t happen regardless of timing or frequency of sex.
Several conditions tied to infertility have their own warning signs:
- Polycystic ovary syndrome (PCOS) causes a hormone imbalance that disrupts ovulation. It’s often accompanied by weight gain, insulin resistance, acne, and unusual hair growth on the face or body.
- Endometriosis can cause painful periods, pain during sex, and heavy bleeding. But some women have no symptoms at all, and trouble getting pregnant is their first indication something is wrong.
- Uterine fibroids are noncancerous growths in the uterus. Symptoms include heavy periods, pelvic pressure, and in some cases, infertility or recurrent miscarriages.
A history of pelvic infections, sexually transmitted infections, or abdominal surgery can also affect fertility by causing scarring in the fallopian tubes or uterus. If any of these apply to you, it’s reasonable to seek an evaluation before hitting the standard 12-month mark.
Signs in Men
Male infertility is harder to spot because it rarely comes with obvious physical symptoms. The primary sign is simply not being able to conceive. There’s no pain, no visible change, and no disruption to daily life in most cases.
That said, low testosterone production from the testicles can sometimes signal a fertility issue. Signs of low testosterone include persistent fatigue, reduced sex drive, erectile problems, unexplained weight gain, and low mood. These don’t confirm infertility on their own, but they suggest a hormonal environment that could affect sperm production.
What You Can Track at Home
If you want to check whether you’re ovulating before seeing a doctor, basal body temperature tracking is one of the simplest tools. Your resting body temperature rises slightly, typically less than half a degree Fahrenheit, after ovulation. When that small increase holds steady for three or more days, ovulation has likely occurred. The key is consistency: take your temperature every morning before getting out of bed, using a digital oral thermometer, after at least three hours of uninterrupted sleep.
You can make this more reliable by also tracking cervical mucus. In the days leading up to ovulation, cervical mucus becomes clear, slippery, and stretchy, similar to raw egg whites. Combining temperature and mucus tracking (sometimes called the symptothermal method) gives you a more complete picture of whether and when you’re ovulating each cycle. Over-the-counter ovulation predictor kits, which detect a hormone surge in urine, offer another option.
If you track for two or three cycles and see no temperature shift and no mucus changes, that’s a meaningful signal worth bringing to a doctor.
How Doctors Evaluate Fertility
A fertility workup typically looks at both partners. For women, blood tests can measure hormones that reflect ovarian function, including how many eggs remain (ovarian reserve) and whether the signals triggering ovulation are working properly. These are usually drawn early in the menstrual cycle.
One common imaging test is a hysterosalpingogram, or HSG. A dye is placed into the uterus and fallopian tubes, then viewed on X-ray. The dye outlines the inner shape of the uterus and shows whether the fallopian tubes are open or blocked. Scarring or structural abnormalities in either location can prevent pregnancy.
For men, the standard first step is a semen analysis. This measures sperm count, movement, and shape. Normal benchmarks, based on World Health Organization standards, include at least 39 million sperm per ejaculate, at least 42% of sperm moving, and more than 4% with normal shape. Falling below these thresholds doesn’t mean pregnancy is impossible, but it does reduce the odds and warrants further evaluation. Any abnormality on a semen analysis or in a man’s medical history is reason for referral to a specialist in male reproductive health.
Weight and Fertility
Body weight has a measurable effect on fertility for both men and women. Women with a BMI over 30 have lower fertility rates, and the impact compounds when both partners carry excess weight. Couples where both members have a BMI over 35 experience about 60% lower odds of conceiving compared to couples where both are under 25. This isn’t just about egg or sperm quality. Excess body fat disrupts hormone balance, interferes with ovulation, and can reduce sperm production. Weight loss, even modest, can meaningfully improve these numbers.
When to Get Evaluated Sooner
The 12-month and 6-month timelines are general guidelines, not hard rules. If you already know you have a condition linked to infertility (PCOS, endometriosis, a history of pelvic inflammatory disease, or prior cancer treatment), doctors recommend immediate evaluation rather than waiting. The same applies if you have very irregular or absent periods, a known hormonal disorder, or if your male partner has a history of testicular injury, surgery, or undescended testicles.
For women over 40, the combination of declining egg quality and quantity means that time matters more. More immediate testing and treatment are warranted, even if you’ve only been trying a few months. Starting the evaluation process early gives you more options and better odds if treatment turns out to be necessary.