Most people with a uterus and regular menstrual cycles can get pregnant, but several factors determine how likely conception is for you specifically. Your age, cycle regularity, hormonal health, and certain physical signs all offer clues about your fertility before you ever see a doctor. Understanding what to look for gives you a clearer picture of where you stand.
Your Menstrual Cycle Is the First Clue
A regular menstrual cycle is one of the strongest everyday indicators that your body is ovulating, which is the essential requirement for natural conception. If your period arrives on a roughly predictable schedule (every 21 to 35 days), that’s a good sign your reproductive system is working as expected. Cycles that are wildly irregular, consistently longer than 35 days, or absent altogether suggest you may not be ovulating regularly, which directly affects your ability to conceive.
Regularity alone doesn’t guarantee ovulation every cycle, but it’s the simplest screening tool you have. If your periods have always been unpredictable, or if they’ve recently changed, that’s worth paying attention to.
Cervical Mucus Tells You When You’re Fertile
Throughout your cycle, the discharge your cervix produces changes in texture and appearance, and these shifts map directly onto your fertility window. Tracking cervical mucus is one of the oldest and most accessible ways to identify when (and whether) your body is preparing to release an egg.
The pattern typically moves through four stages. After your period, discharge is dry or sticky, like paste. It then becomes creamy and smooth, similar to yogurt. As you approach ovulation, it turns wet, watery, and clear. At peak fertility, it stretches between your fingers and looks like raw egg whites. That slippery, stretchy mucus makes it physically easier for sperm to travel through the uterus. If you consistently see this egg-white mucus mid-cycle, your body is likely ovulating. If you never notice it, that could indicate an ovulation problem worth investigating.
Temperature Tracking Can Confirm Ovulation
Basal body temperature, your body’s resting temperature first thing in the morning, rises slightly after ovulation. The increase is small, typically less than half a degree Fahrenheit, but it’s measurable with a sensitive thermometer. Some people see a jump as small as 0.4°F, while others see up to 1°F.
The key pattern to look for: when your temperature stays elevated for at least three consecutive days, you can assume ovulation occurred. This method confirms ovulation after the fact rather than predicting it, so it’s most useful over several months of charting. If you track for two or three cycles and never see a sustained temperature rise, that’s a signal you may not be ovulating consistently.
Ovulation Predictor Kits
Over-the-counter ovulation predictor kits detect a surge in luteinizing hormone (LH) in your urine, which typically happens 24 to 36 hours before ovulation. You test once daily starting a few days before you expect to be fertile, and a positive result means ovulation is likely imminent.
These kits are widely available and simple to use, but they’re not perfect. False positives can happen if your body produces excess LH without actually releasing an egg. Consistent negatives over multiple cycles may point to an ovulatory dysfunction. Used alongside cervical mucus tracking and temperature charting, they give you a more complete picture than any single method alone.
Age Has the Biggest Impact on Fertility
No factor affects your chance of conceiving more than age. In your early to mid-20s, the probability of getting pregnant in any given cycle is about 25 to 30 percent. That number declines gradually through your 30s. By age 40, the chance drops to around 5 percent per cycle. This decline reflects both a shrinking supply of eggs and a decrease in egg quality over time.
This doesn’t mean pregnancy after 35 or 40 is impossible. It means it typically takes longer, and the odds per attempt are lower. If you’re under 35 and wondering whether you can get pregnant, time is more on your side than you might think. If you’re over 35, it’s reasonable to be more proactive about getting answers sooner.
Blood Tests That Measure Your Egg Supply
If you want a more concrete answer about your fertility, two blood tests can estimate your ovarian reserve, which is roughly how many eggs you have left.
The first is the AMH test (anti-Müllerian hormone). This hormone is produced by cells in your ovarian follicles, so its level correlates with your remaining egg supply. Average AMH falls between 1.0 and 3.0 ng/mL. Below 1.0 is considered low, and below 0.4 is severely low. To put those numbers in context by age: the lower end of typical at 25 is about 3.0 ng/mL, at 30 it’s 2.5, at 35 it’s 1.5, at 40 it’s 1.0, and at 45 it’s 0.5. AMH can be tested on any day of your cycle.
The second is a day-3 FSH test (follicle-stimulating hormone), drawn on the third day of your period. Your brain produces FSH to stimulate your ovaries. When your egg supply is lower, your body compensates by producing more FSH, so higher numbers are actually a warning sign. Levels below 15 mIU/mL are associated with better conception outcomes, while levels above 25 mIU/mL correlate with significantly lower chances.
Neither test tells you definitively whether you can or can’t get pregnant. A person with low AMH can still conceive naturally, and someone with normal levels might face other obstacles. But together, these tests give you and a doctor meaningful data to work with.
Signs That Something May Be Off
Certain symptoms suggest underlying conditions that commonly affect fertility. Two of the most significant are PCOS (polycystic ovary syndrome) and endometriosis.
PCOS often shows up as irregular or absent periods, unexplained weight gain, and signs of excess androgens like acne or unusual hair growth. The core fertility issue with PCOS is that it can prevent ovulation entirely. Blood tests can confirm whether you’re ovulating, and an ultrasound can reveal the characteristic pattern on your ovaries. PCOS is one of the most common causes of infertility, but it’s also one of the most treatable.
Endometriosis tends to announce itself through increasingly heavy and painful periods, sharp pains at other points in the cycle (especially in the lower abdomen), bloating, and bleeding so heavy it disrupts your daily life. Endometriosis can affect fertility by distorting the anatomy around the fallopian tubes and ovaries, creating inflammation, or interfering with implantation. Diagnosis sometimes requires ultrasound, a detailed medical history, or in more advanced cases, surgery. Stages range from mild to severe, and fertility impact varies widely.
Other red flags include a history of pelvic infections, thyroid problems, or significant changes to your cycle after stopping hormonal birth control that persist beyond a few months.
When to Get a Professional Evaluation
The American College of Obstetricians and Gynecologists recommends a fertility evaluation if you’ve been having regular unprotected sex for one year without conceiving. If you’re over 35, that timeline shortens to six months. If you’re over 40, it’s worth having the conversation now, before you start trying or early in the process.
A fertility evaluation typically includes the blood tests described above, an ultrasound to check your ovaries and uterus, and often a test to confirm your fallopian tubes are open. Your partner’s sperm will also be evaluated, since male factors account for roughly a third of infertility cases. The process is straightforward and can usually be completed within a single menstrual cycle, giving you real answers relatively quickly.