If you’ve been having regular unprotected sex for 12 months without getting pregnant, that meets the clinical definition of infertility. For women over 35, that timeline shortens to 6 months. For women over 40, experts recommend an evaluation before you even start trying. But beyond those timelines, your body often gives earlier signals that something may be off. Knowing what to look for can help you seek answers sooner rather than later.
What Your Period Is Telling You
Your menstrual cycle is one of the most accessible windows into your fertility. A cycle that runs shorter than 21 days, longer than 35 days, or varies wildly from month to month can mean you’re not ovulating regularly. No ovulation means no egg available to be fertilized, which is one of the most common reasons people struggle to conceive.
Absent periods are an even clearer signal. If your period disappears for months at a time (outside of pregnancy or breastfeeding), your body likely isn’t releasing eggs. Extremely heavy or painful periods can also point to underlying conditions like endometriosis or fibroids, both of which can interfere with conception. A history of pelvic inflammatory disease or repeated miscarriages is another reason to seek evaluation early rather than waiting out the standard 12-month window.
Signs That Don’t Seem Related to Fertility
Some fertility problems announce themselves through symptoms you might not connect to getting pregnant at all. Hormonal imbalances, particularly those seen in polycystic ovary syndrome (PCOS), can show up as persistent acne, thinning hair on your head, or excess hair growth on your face, chest, or back. These are driven by elevated levels of male hormones that also disrupt ovulation. PCOS is diagnosed when at least two of three features are present: signs of excess male hormones, irregular or absent ovulation, and cysts on the ovaries visible on ultrasound.
Unexplained weight gain, especially around the midsection, can also be tied to the insulin resistance that frequently accompanies PCOS. If you notice several of these changes together, they’re worth mentioning to your doctor even if your periods seem relatively normal.
Silent Endometriosis
Endometriosis is a condition where tissue similar to the uterine lining grows outside the uterus, and it affects fertility in a significant number of cases. What makes it tricky is that severity of symptoms doesn’t always match severity of disease. Many people who struggle to conceive turn out to have “silent” endometriosis, meaning they have little or no pelvic pain and no obvious cycle disruption. The condition can cause inflammation, scarring, or blockages in the reproductive tract without producing the kind of dramatic symptoms that would send you to a doctor. It’s often only discovered during a fertility workup.
When the Issue Is on His Side
Roughly a third of infertility cases involve a male factor, so it’s not just about the person trying to carry the pregnancy. Some signs that a male partner may have a fertility issue include difficulty maintaining erections, low sex drive, pain or swelling in the testicle area, or noticeably small volumes of ejaculate. Less obvious signs include reduced facial or body hair growth, or unexpected breast tissue development, both of which can signal hormonal problems that affect sperm production.
Many male fertility issues produce no symptoms at all. Sperm count, movement, and shape can all be below the threshold needed for conception without causing any noticeable changes in how a man looks or feels. A semen analysis is a straightforward test and one of the first steps in any fertility evaluation.
What Home Tracking Can (and Can’t) Tell You
Ovulation predictor kits, which detect the hormone surge that triggers egg release, are a reasonable starting point for understanding your cycle at home. But they aren’t perfect. You can get false positives, and consistently negative results over several cycles may indicate that you’re not ovulating. Persistent positives, on the other hand, can sometimes reflect excess levels of that triggering hormone rather than actual ovulation, which is common in conditions like PCOS.
Tracking your basal body temperature or cervical mucus changes can add another layer of information. If you’ve been tracking for several months and never see a clear temperature shift or the characteristic egg-white mucus around mid-cycle, that pattern is worth bringing to a doctor. These tools are useful for gathering data, but they can’t diagnose the underlying cause of a problem.
Tests That Give You Real Answers
When you do see a doctor, the evaluation typically moves through a few key tests. One of the most informative for women is a blood test measuring anti-Mullerian hormone (AMH), which gives an estimate of your remaining egg supply. Average AMH falls between 1.0 and 3.0 ng/mL. Levels under 1.0 are considered low, and below 0.4 is severely low. These numbers naturally decline with age: a typical 30-year-old might have an AMH around 2.5, while a 40-year-old might be closer to 1.0. A low result doesn’t mean pregnancy is impossible, but it does help your doctor understand how urgently to pursue treatment and which options make the most sense.
Another common test is a hysterosalpingogram, an imaging procedure where dye is pushed through your uterus and fallopian tubes while X-rays are taken. If the dye flows freely through both tubes and spills out the ends, the tubes are open. If it stops, there’s a blockage. The same test can reveal structural differences in the uterus, like a divided uterine cavity or fibroids, that could be preventing implantation. Hormone panels checking thyroid function, prolactin, and other reproductive hormones round out the picture.
For male partners, a semen analysis evaluates sperm count, how well sperm swim, and the percentage with normal shape. All three factors matter, and problems with any one of them can reduce the chances of conception.
Red Flags That Warrant an Earlier Evaluation
You don’t need to wait the full 12 months (or 6 months if you’re over 35) if you already know something is off. Reasons to seek help sooner include:
- Irregular or absent periods, which suggest ovulation problems
- A history of pelvic inflammatory disease, which can scar the fallopian tubes
- Two or more miscarriages, which may point to hormonal, genetic, or structural issues
- Previous cancer treatment, since chemotherapy and radiation can damage eggs or sperm
- Known endometriosis, even if symptoms are mild
- A male partner with known testicular issues, prior surgeries, or hormonal concerns
Fertility declines gradually through your late 20s and more steeply after 35, so age alone can be reason enough to move up the timeline. The goal of early testing isn’t to label you as infertile. It’s to find treatable problems before time makes them harder to address.