| "Helping women track their ovulation in a smarter way" | 
For years, the advice was the same. Track your period, count to day 14, and that's when you ovulate.
It sounds simple. It's also wrong for most people, most of the time. A textbook 28-day cycle with ovulation right in the middle describes very few real women. One month you're at 28 days. The next time you traveled, or got sick, or work fell apart, and you're at 35. Your fertile window moved with it, and the calendar had no way of knowing.
So people track for months and still feel like they're guessing. When our Senior Medical Advisor, Dr. Patti Haebe, sat down with the FemtechWorld podcast, this was the thread she kept returning to: the problem was rarely a lack of data. It was understanding it.
"You're collecting it all," she said, "but what does it all tell you?"
That question is the whole story of where fertility tracking is going.
The calendar was never going to work
A calendar predicts your cycle based on an average. Your body doesn't run on an average.
Stress, illness, travel, a hard month, any of these can shift when you ovulate. If you're expecting a 28-day cycle and you actually have a 35-day one, you can miss your fertile window completely, sometimes by a week. And that window is smaller than most people realize. There are only about six days in any cycle when pregnancy is possible: the day of ovulation and the five days before it.
The calendar can tell you what an average should look like. It can't tell you what your body is doing right now. For that, you have to read the signals.
Your body is already keeping records
Your cycle produces measurable information all month long, and until recently, most of it required a lab to see.
Luteinizing hormone, or LH, is the one most people know. It's released from the brain and tells the ovary it's time to release an egg. A standard ovulation test shows LH as a line or a smiley face, positive or negative. That's useful, but it's blunt. A quantitative test reads LH as an actual number, the same kind of value a lab would give you, so you can watch it rise and see your peak instead of squinting at whether today's line looks darker than yesterday's.
Basal body temperature, your resting temperature first thing in the morning, rises slightly after ovulation. Progesterone, measured at home through a urine metabolite called PdG, shows up only after an egg has been released. Cervical mucus changes too.
Each of these answers a different question. That's the part that changes everything.
Why one signal isn't enough
LH is predictive. It tells you ovulation is probably coming. What it can't do is tell you ovulation actually happened.
That's where the other signals earn their place. As Dr. Haebe explained, basal body temperature and PdG look backward. A temperature rise and rising progesterone together suggest that ovulation likely occurred and that the second half of your cycle is doing what it should. LH looks forward, temperature and progesterone look back, and read together they give you a fuller picture than any single test on its own.
This is the whole reason the Premom app and easy@Home ovulation tests are built to work as a system. The tests capture the signals. The app charts them together, so instead of a drawer full of used strips you have one clear picture of your cycle.
What AI is actually doing here
AI in fertility isn't about a machine promising you a due date. The useful part is quieter than that.
"AI is really what's making data legible at scale," Dr. Haebe said, and that's the honest version of what's happening. Most people getting started are handed a pile of new vocabulary, LH surges, luteal phase, PdG, basal body temperature, and left to work out what it all means. Collecting it is easy now. Understanding it was the barrier.
Premom's Ask AI Pro is built to close that gap. You can ask a question about your own cycle in plain language, the way you'd ask a friend who happened to be a fertility expert, and get information drawn from your own data rather than a generic average. It's the kind of thing you reach for at 2am when you can't sleep and can't stop wondering whether today was the day.
The other quiet advantage is personalization. The app learns your pattern over time. Dr. Haebe calls the first month the "get to know you" period. After that, it starts to recognize your typical surge timing, your luteal phase length, your hormone curve. Her way of putting it stuck with us: you're not a textbook.
Ask AI is for information and education. It isn't medical advice, a diagnosis, or a substitute for your doctor.
Cycle changes can start earlier than you'd expect
One part of the conversation surprised even us. The shifts that come with perimenopause, shorter cycles, a shrinking luteal phase, rising FSH, can begin earlier than the stereotype suggests. Dr. Haebe said she regularly sees women in their early to mid 30s noticing these changes.
You can now log FSH at home in the Premom app alongside everything else. That doesn't replace a conversation with your doctor, and it shouldn't. What it does is help you notice a pattern early enough to have that conversation sooner, whether you're still hoping to conceive or simply trying to understand what your body is doing.
The real shift: walking in with proof
The moment Dr. Haebe seemed most excited about is the one that matters most.
Picture two versions of the same doctor's appointment. In the first, you say your cycles feel irregular and you're not sure you're ovulating. In the second, you bring six months of organized data: your LH trends, your temperature shifts, your progesterone readings. Your provider can see the pattern quickly, a short luteal phase, an irregular cycle, a month where ovulation may not have happened at all.
That's the difference between a vague history and a real conversation. Premom even has a provider portal, so a clinician can look through a patient's charts directly instead of scrolling through a phone. Dr. Haebe described it turning a ten-minute struggle into a three-minute read.
That's what all of this is really for. The data was always yours. Now you can actually understand it, and use it to advocate for yourself.
Key questions from the episode
Because your cycle can be different month to month. A lot of people expect a perfect 28-day cycle with ovulation on day 14, but one month you might be at 28 days and the next at 35 because you traveled, had a stressful week, or got sick. That's common, and it doesn't mean anything's wrong. The trouble is that when your fertile window moves and you're still counting on the calendar, you can miss it. A calendar can't account for what your hormones are actually doing.
Much more than most people realize. Your body gives off information all month: luteinizing hormone (LH), basal body temperature, PdG (a progesterone metabolite), and changes in cervical mucus. On top of that, the subtler things, mood, energy, motivation, sleep, all shift with your hormones through the cycle. Being able to track those signals at home, right from your phone, is what helps you understand what your body is doing instead of guessing.
Not on its own. LH is a predictive signal, not a confirmatory one. It tells you ovulation is probably coming, usually about a day out from your peak, but it doesn't tell you ovulation actually happened. That's why I like a multi-signal approach. Basal body temperature and PdG progesterone testing look at the other side of it and can suggest ovulation likely did occur. LH looks forward, temperature and progesterone look back.
A standard test gives you a positive or negative, or a smiley face, and a lot of people don't know what to do with that. A digital ovulation test reader, like the Premom app, takes the subjectivity out of it. Instead of holding two strips up in your bathroom trying to decide if today's line is darker than yesterday's, you get an actual number, measured in the same units a lab would use, and the app charts it. That turns a test strip into something you can read as a trend and act on.
Progesterone is only produced after ovulation. Once an egg is released, the corpus luteum, the structure left behind, starts to secrete it. So testing PdG, the progesterone metabolite in urine, after your LH peak can suggest ovulation likely happened and give you a sense of how the second half of your cycle is progressing. Progesterone also raises your body temperature slightly, which is why basal body temperature tells a similar story.
It depends on your body, which is exactly why watching the pattern matters. Research, and what we see in our own users, shows that roughly half of women have a rapid LH surge that can rise and fall within 24 hours or less, and about half have a more gradual build. If you have a rapid surge and you're only testing once a day, you can miss it. Once you can see your pattern over a few cycles, you can get a real sense of how and when to test to catch your own surge.
The honest answer is that AI's most useful job right now is making your data understandable. When you're new to this, you're learning about LH surges, PdG, and basal body temperature all at once, and collecting it is the easy part. Understanding what it means is the barrier. With Premom's Ask AI Pro, you can ask about your own cycle in plain language and get information based on your individual data, not a population average. It's there whenever you need it, even at 2 am. It's meant to help you understand your own chart, not to replace your doctor.
Earlier than a lot of people expect, yes. The shifts, shorter cycles, a shrinking luteal phase, rising FSH, can begin in the early to mid 30s, and I see it in my office regularly. You can now log FSH at home in the Premom app along with your other signals, which can help you notice a change early. It isn't a diagnosis and it isn't a replacement for your doctor, but it can help you start that conversation sooner, whether you're trying to conceive or just trying to understand what's going on.
Dr. Patti Haebe, NMD joined Stephanie Price on the FemtechWorld podcast to talk through all of this. Watch and listen to the full episode, or download the free Premom app to start reading your own signals.
Premom provides educational information and tracking tools. It is not medical advice. For medical guidance, consult a healthcare professional.
