The standard threshold is 12 months of regular, unprotected sex without conceiving if you’re under 35, and 6 months if you’re 35 or older. If you’re over 40, seeking an evaluation right away is reasonable. But those timelines shift earlier when certain medical conditions are in the picture, and understanding where you fall can save months of unnecessary waiting.
The Age-Based Timelines
The American Society for Reproductive Medicine defines infertility as failure to conceive after 12 months of regular, unprotected intercourse. “Regular” generally means two to three times per week. For women under 35, that 12-month mark is when both evaluation and treatment should begin. For women 35 and older, the window shortens to 6 months. For women over 40, guidelines recommend more immediate evaluation, meaning you don’t necessarily need to wait at all before seeing a specialist.
These cutoffs exist because egg quality and quantity decline with age, and the decline accelerates sharply after 35. A blood test called AMH (anti-Müllerian hormone) gives a snapshot of ovarian reserve. The typical AMH level for a 30-year-old is about 2.5 ng/mL, but by 35 it drops to around 1.6, and by 40 it’s roughly 0.7. Women whose levels fall below the 10th percentile for their age (below 0.39 at 35, for instance) may want to discuss their reproductive timeline with a specialist sooner rather than later.
The success rates of fertility treatment reflect this same curve. For women over 40 using IVF, the two-year cumulative live birth rate drops from about 56% at age 40 to 19% at 43 and near zero by 46. Every year of delay matters more the older you are.
When You Shouldn’t Wait
Several conditions warrant skipping the standard waiting period entirely, regardless of your age:
- Irregular or absent periods. Cycles that are very infrequent (oligomenorrhea) or missing altogether (amenorrhea) signal that ovulation may not be happening regularly. Without ovulation, conception can’t occur on its own.
- Known or suspected endometriosis. Particularly moderate to severe endometriosis (stage III or IV), which can damage the fallopian tubes and surrounding tissue.
- Uterine or tubal problems. A history of pelvic inflammatory disease, prior ectopic pregnancy, or known structural issues with the uterus or fallopian tubes all justify an earlier consultation.
- Painful periods. While some cramping is normal, severe pain during menstruation can point to endometriosis or other conditions that affect fertility.
- Known male factor infertility. If your partner has a history of low sperm count, testicular trauma, impaired sexual function, or prior surgeries in the groin area, evaluation should happen sooner.
If any of these apply to you, there’s no clinical reason to wait 6 or 12 months before seeing a specialist. The waiting period assumes that nothing obvious is interfering with conception. When something is, time spent waiting is time wasted.
Secondary Infertility Has the Same Rules
If you’ve had a baby before and are now struggling to conceive again, the same age-based timelines apply. Under 35, providers typically diagnose secondary infertility after 12 months of trying. Over 35, that drops to 6 months. Having conceived before doesn’t guarantee it will happen again easily. Age, changes in health, new medical conditions, or shifts in a partner’s sperm quality can all play a role the second time around.
OB-GYN Visit vs. Fertility Specialist
Before jumping to a reproductive endocrinologist (the doctors who specialize in fertility treatment), a preconception visit with your regular OB-GYN is a smart first step. This visit focuses on optimizing your overall health: managing chronic conditions like thyroid disease, diabetes, or high blood pressure, reviewing medications for safety during pregnancy, updating vaccinations, screening for infections, and assessing your weight and nutritional status. Your OB-GYN can also take a family history and offer genetic screening if needed.
A reproductive endocrinologist does something different. They investigate why conception isn’t happening and offer treatments ranging from ovulation-stimulating medication to IVF. If your OB-GYN identifies a potential fertility issue during preconception counseling, or if you’ve already hit the recommended time threshold without conceiving, that’s when a referral to a fertility specialist makes sense. Some people go directly to an REI, which is also fine, especially if you already know about a condition that affects fertility or if you’re over 40.
What Happens at the First Evaluation
The initial fertility workup typically involves both partners. For women, expect blood tests to check hormone levels (including AMH and others that reflect ovarian function), an imaging test to see whether the fallopian tubes are open and the uterus looks normal, and tracking of ovulation through blood work or ultrasound. For men, a semen analysis is standard. It measures sperm count, movement, and shape. If results are abnormal, particularly if sperm concentration is very low, additional hormone testing may follow.
The goal is to find the most common causes using the least invasive methods first. The evaluation itself usually takes a few weeks to complete, depending on where you are in your menstrual cycle when you start.
Lifestyle Changes and How Long They Take
If your evaluation reveals issues that lifestyle changes could improve, particularly on the male side, know that sperm take roughly 2.5 to 3 months to fully develop. That means changes like quitting smoking, reducing alcohol, improving sleep, exercising regularly, and eating better won’t show up in a semen analysis for about three months. Some evidence suggests meaningful improvements in sperm quality can appear within that timeframe when multiple habits change simultaneously.
This doesn’t mean you should delay treatment for months to “get healthy first.” In many cases, your fertility specialist will recommend lifestyle modifications alongside medical treatment rather than instead of it. But if your evaluation suggests mild male factor issues and you’re not yet at a point where time pressure is critical, a few months of focused lifestyle improvement can be worthwhile before escalating to more intensive interventions.
Insurance May Affect Your Timeline
In the United States, insurance coverage for fertility treatment varies dramatically by state. Some states mandate that employer health plans cover diagnosis and treatment, including IVF. California, for example, passed a law requiring large-group plans to cover IVF and fertility preservation starting in January 2026. Other states have had mandates in place for years, while many still have none.
Insurance requirements sometimes mirror the clinical guidelines, requiring documentation that you’ve been trying for 6 or 12 months (depending on your age) before they’ll cover treatment. This can feel frustrating if you already know something is wrong, but most plans also cover diagnostic evaluation even before those time thresholds are met. Check your specific plan’s language carefully, because the difference between “infertility diagnosis” coverage and “infertility treatment” coverage can determine what’s paid for and when.