There’s no single test that gives you a fertility score, but several reliable indicators, both at-home and medical, can paint a detailed picture of where you stand. Your age, cycle patterns, hormone levels, and a partner’s sperm health all factor in. Some of these you can track tonight; others require a blood draw or ultrasound. Here’s how to piece the picture together.
Age Is the Strongest Single Predictor
Before anything else, age gives you a rough probability. A healthy 30-year-old has about a 20% chance of conceiving in any given cycle. By 40, that drops below 5% per cycle. Those numbers don’t mean something is “wrong” at 40. They reflect a natural decline in egg quantity and quality that accelerates in the mid-30s. If you’re under 35 and have been trying for 12 months without success, fertility specialists recommend an evaluation. If you’re 35 or older, that window shortens to 6 months. Over 40, earlier evaluation is reasonable even before that timeline plays out.
Track Your Cervical Mucus
One of the simplest at-home fertility signs is the fluid your cervix produces throughout your cycle. Its texture changes in a predictable pattern that mirrors your fertile window. In a typical 28-day cycle, it looks roughly like this:
- Days 1 to 4 (after your period): Dry or tacky, white or slightly yellow.
- Days 4 to 6: Sticky, slightly damp, white.
- Days 7 to 9: Creamy, yogurt-like, wet and cloudy.
- Days 10 to 14: Stretchy, slippery, resembling raw egg whites.
- Days 15 to 28: Dry again until your period starts.
That egg-white stage is the key signal. Slippery, stretchy mucus creates a friendly environment for sperm to travel through the cervix and reach an egg. You’ll typically notice it for three or four days. If you consistently see this pattern each month, your body is likely producing the hormonal shifts needed for ovulation. If your mucus stays dry or sticky throughout the entire cycle, that could indicate you’re not ovulating regularly.
Use Ovulation Predictor Kits
Ovulation predictor kits (OPKs) are urine-based strips that detect a surge in luteinizing hormone, the chemical trigger that tells your ovaries to release an egg. The surge typically happens one to one and a half days before ovulation, giving you a short but actionable heads-up. These kits are about 90% accurate when used correctly, which means following the timing and instructions on the package closely. A positive result doesn’t guarantee you’ll ovulate, but consistently seeing a surge each month is a strong sign your hormonal signaling is working as expected.
If you never detect a surge over several cycles, it may point to irregular or absent ovulation, which is worth discussing with a doctor.
Basal Body Temperature Tells You After the Fact
Your resting body temperature shifts slightly after ovulation, typically rising by less than half a degree Fahrenheit (about 0.3°C). To catch this shift, you need to take your temperature first thing every morning before getting out of bed, using a thermometer sensitive enough to register small changes. Over a few months of charting, you’ll start to see a pattern: lower temperatures in the first half of your cycle, then a small, sustained rise after ovulation that lasts until your next period.
The catch is that this method confirms ovulation only after it’s already happened, so it’s less useful for timing sex in a given cycle. Its real value is in showing you, over time, whether you’re ovulating consistently. If your chart stays flat with no clear temperature shift, that’s a sign ovulation may not be occurring.
What Your Cycle Length Reveals
Regular cycles between roughly 21 and 35 days are a good baseline sign. Consistent timing from one period to the next suggests your hormones are cycling through their normal rhythm. What’s more telling than cycle length, though, is sudden change. Cycles that are getting noticeably shorter over time, especially if they were previously regular, can be an early sign of declining ovarian reserve. Periods that are very irregular, very far apart, or frequently skipped may point to conditions like polycystic ovary syndrome (PCOS) or other ovulatory disorders.
AMH: A Blood Test for Egg Supply
Anti-Müllerian hormone, or AMH, is produced by the small follicles in your ovaries. A simple blood test measures how much of it is circulating, which gives doctors an estimate of how many eggs you have left. Unlike most fertility hormones, AMH stays relatively stable throughout your cycle, so it can be drawn on any day. Typical values decline with age:
- Age 25: around 3.0 ng/mL
- Age 30: around 2.5 ng/mL
- Age 35: around 1.5 ng/mL
- Age 40: around 1.0 ng/mL
- Age 45: around 0.5 ng/mL
These figures sit on the lower end of normal for each age group, so a result near or below them could suggest a lower-than-average egg reserve. A higher AMH doesn’t guarantee easy conception, and a lower one doesn’t mean you can’t conceive. It’s a piece of the puzzle, not the whole picture. AMH is especially useful if you’re considering egg freezing or IVF, because it helps predict how your ovaries will respond to stimulation medications.
Antral Follicle Count on Ultrasound
An antral follicle count is done via transvaginal ultrasound, usually early in your cycle. The technician counts the small, resting follicles (roughly 2 to 9 mm in diameter) visible on each ovary. These follicles represent the pool of eggs available to mature in coming months, and their number reflects the much larger reserve of microscopic eggs you can’t see on imaging.
A count between 14 and 21 is considered a normal, intermediate range. Counts between 22 and 35 suggest a strong reserve with excellent expected response to fertility treatments if needed. Fewer visible follicles generally means fewer eggs remaining overall, though individual cycles can vary. Combined with AMH and your age, the antral follicle count gives fertility specialists the clearest available snapshot of ovarian reserve.
Don’t Overlook Sperm Health
Fertility is always a two-person equation when a male partner is involved, and male factors contribute to roughly half of all infertility cases. A semen analysis is straightforward: it measures volume, concentration, and how well sperm move. Current reference values consider normal to be a concentration of at least 16 million sperm per milliliter, total motility of 42% or higher, and progressive motility (sperm swimming forward effectively) of at least 30%.
Because the test is noninvasive and inexpensive compared to most female fertility workups, it makes sense to check early rather than assuming the issue lies on one side.
When Diminished Reserve Has No Symptoms
One of the trickier aspects of fertility assessment is that reduced egg supply often has no obvious signs. Most people with diminished ovarian reserve discover it only after months or years of trying to conceive without success. Some notice their cycles getting consistently shorter. In more advanced cases, particularly with premature ovarian insufficiency (when the ovaries slow down significantly before age 40), symptoms can resemble early menopause: hot flashes, irregular periods, and vaginal dryness. But for many, the only clue is time passing without a positive pregnancy test, which is why proactive testing with AMH or an ultrasound can be valuable if you want concrete information rather than waiting to find out the hard way.
Putting the Pieces Together
No single method gives you the full answer. Cervical mucus and OPKs tell you whether you’re ovulating in real time. Basal temperature charting confirms it over months. AMH and an antral follicle count estimate how many eggs you have in reserve. Cycle regularity signals whether your hormones are functioning in rhythm. And a semen analysis covers the other half of the equation. Used together, these tools create a layered, practical picture of your fertility that’s far more informative than any one test alone.