Infertility is clinically defined as the inability to conceive after 12 months of regular, unprotected sex if you’re under 35, or after 6 months if you’re 35 or older. There’s no single symptom that confirms infertility on your own, but several physical signs, cycle patterns, and at-home tracking methods can give you early clues that something may be off before you ever see a specialist.
The Timeline That Matters Most
The most straightforward indicator of a fertility problem is time. If you’ve been having unprotected sex consistently for a year without conceiving and you’re under 35, that meets the clinical threshold for infertility. If you’re 35 or older, that window shortens to six months. These aren’t arbitrary cutoffs. They reflect the fact that egg quality and quantity decline with age, and earlier evaluation gives you more options.
These timelines also apply if you’ve had a child before. Secondary infertility, the inability to get pregnant or carry a pregnancy to term after a previous birth that happened without fertility treatment, is more common than many people expect. Age, weight changes, complications from a prior pregnancy or surgery, and sexually transmitted infections can all contribute to fertility problems that weren’t there the first time around.
Signs in Women That May Point to a Problem
The most telling clue is your menstrual cycle. A cycle shorter than 21 days, longer than 35 days, or one that’s highly irregular or absent altogether can signal that you’re not ovulating. Without ovulation, pregnancy isn’t possible. In some cases, an absent or irregular period is the only noticeable symptom.
Polycystic ovary syndrome (PCOS) is one of the most common causes of ovulatory problems. It’s a hormonal imbalance that disrupts ovulation and is often associated with insulin resistance, weight gain, acne, and unusual hair growth on the face or body. PCOS is diagnosed when at least two of three features are present: signs of elevated androgens (like acne or excess hair), irregular or absent periods, and polycystic ovaries seen on ultrasound.
Endometriosis is another major contributor. If you experience severe pelvic pain, especially during your period, pain during sex, or heavy bleeding, these can be signs worth investigating. Endometriosis can cause scarring and structural damage that blocks or impairs the fallopian tubes, even when your cycle seems regular.
Signs in Men That May Point to a Problem
Male factors contribute to roughly half of all infertility cases, yet many men don’t realize there are physical signs worth paying attention to. Changes in sexual function are among the most noticeable: difficulty with erections, reduced sex drive, problems with ejaculation, or noticeably low volumes of ejaculate. Pain, swelling, or a lump in the testicle area also warrants attention.
Some signs are less obvious. Decreased facial or body hair can reflect a hormonal imbalance. Abnormal breast tissue growth in men is another hormonal red flag. Recurrent respiratory infections paired with infertility can occasionally point to a rare genetic condition. Even a reduced ability to smell has been linked to certain chromosomal abnormalities that affect fertility. None of these signs confirm infertility on their own, but they’re worth mentioning to a doctor if you’re having trouble conceiving.
What You Can Track at Home
Before seeing a specialist, you can gather useful information about your own fertility by tracking ovulation. The simplest method is monitoring your basal body temperature, your temperature first thing in the morning before getting out of bed. After ovulation, your body temperature rises slightly due to increased progesterone, typically by 0.4 to 1.0 degrees Fahrenheit. When you see higher temperatures for at least three consecutive days, you can assume ovulation occurred.
The limitation is that this method tells you ovulation already happened rather than predicting it in advance. It’s also unreliable if your cycles are irregular, you’re not sleeping well, you’re stressed, or you’re drinking alcohol, all of which can throw off your readings. Over-the-counter ovulation predictor kits, which detect a hormone surge in your urine before ovulation, can complement temperature tracking and give you a more complete picture.
If you track for two or three months and never see a temperature shift, or if ovulation kits consistently show no surge, that’s a meaningful signal to bring to your doctor. It suggests you may not be ovulating regularly.
Medical Tests for Women
When you do see a specialist, a few key tests help paint a clearer picture. One of the most informative is the Anti-Müllerian Hormone (AMH) blood test, which estimates your ovarian reserve, essentially how many eggs you have left. Average AMH levels fall between 1.0 and 3.0 ng/mL. Below 1.0 is considered low, and 0.4 or below is severely low. To put those numbers in context: a typical 30-year-old might have an AMH around 2.5, while a 40-year-old might be around 1.0. AMH doesn’t tell you everything about egg quality, but it gives doctors a useful baseline.
Another common test is the hysterosalpingogram, or HSG. This is an X-ray procedure where dye is injected through the cervix and into the uterus. If the dye flows freely through both fallopian tubes and spills out the ends, the tubes are open. If the dye hits a barrier, it reveals a blockage. The HSG can also detect structural abnormalities in the uterus itself, including fibroids, polyps, adhesions, and variations in uterine shape that can interfere with implantation. Hormone blood tests for thyroid function, prolactin, and reproductive hormones like FSH and estradiol round out most initial evaluations.
Medical Tests for Men
A semen analysis is the cornerstone of male fertility testing. It measures sperm concentration, motility (how well they swim), and morphology (their shape). Current reference values consider a concentration of at least 16 million sperm per milliliter normal, with total motility of 42% or higher and progressive motility of at least 30%. Falling below these thresholds doesn’t necessarily mean natural conception is impossible, but it does indicate reduced odds and may call for further evaluation.
If results come back abnormal, doctors may order hormone testing to check testosterone and other related levels, or an ultrasound to look for structural issues like a varicocele, an enlarged vein in the scrotum that can impair sperm production by raising the temperature around the testicles.
When Known Risk Factors Should Speed Things Up
The standard timelines of 6 or 12 months don’t apply to everyone. If you already know you have a condition associated with infertility, earlier evaluation makes sense. For women, this includes a history of PCOS, endometriosis, pelvic inflammatory disease, or prior surgery involving the reproductive organs. For men, relevant history includes undescended testicles (even if corrected in childhood), prior chemotherapy, or pelvic or abdominal surgery. In these situations, evaluation is recommended regardless of how long you’ve been trying.
Lifestyle factors also play a role. Smoking, heavy alcohol use, and significant changes in body weight can all reduce fertility in both men and women. These aren’t causes of permanent infertility in most cases, but they can meaningfully delay conception and are worth addressing early.