Over 10,000+ 4.9/5-Star Reviews
In Partnership with Rumer Willis
Rumer Willis Wants Six, Seven, Maybe Eight More Kids. She's Not Leaving a Single Cycle to Chance.
Thanks to Mira, Rumer tracks her actual hormone levels every morning, so nothing's left to guesswork. Learn more about the routine behind her next pregnancy.
Rumer Willis · Actress, mother, Mira Ultra4™ partner
4.9/5 from 10,000+ reviews
"My ovulation was off by a week. I know that because I tracked it with Mira."
— Rumer Willis
Rumer Willis is in her late thirties, already a mom, and wants several more kids. Instead of guessing at her fertile window, she tracks four real hormone numbers every morning with Mira Ultra4™.
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One Wand. Four Real Numbers.
Not a Yes-or-No.
Mira Ultra4™ reads LH, E3G (estrogen metabolite), PdG (progesterone metabolite), and FSH — four hormones, from a single wand, once a day. An actual number for each, using fluorescent detection technology (the same category used in real labs) — up to 99.5% accuracy in hormone detection for LH and PdG.¹ Here’s why measuring each is important when trying to get pregnant.
The Mira Ultra4™ Kit is the only at-home hormone monitor that tracks 4 key hormones — LH, E3G (estrogen metabolite), PdG (progesterone metabolite), and FSH, with lab-grade technology.² It's validated against the clinical gold standard: ultrasound-confirmed ovulation*, built for the transition nobody fully explained to you.
"One wand tracks all four hormones and gives me real numbers — not just a yes or no like everything else I've tried."
— Rumer Willis
LH
surges in the 24–36 hours before ovulation — the clearest signal that your fertile window is about to peak.
E3G
(Estrogen metabolite) rises in the days leading up to that surge, showing your fertile window opening before LH alone would catch it.
PdG
(Progesterone metabolite) rises after ovulation, helping confirm ovulation happened and showing whether your luteal phase is holding up.
FSH
Supports follicle development each cycle, part of the fuller picture, not just the surge.
See What's In the Box
One monitor, one box of wands, the free Mira app. That's the full Ultra4™ setup.
Building a Family, Without Leaving It to Chance
This isn't a fertility-crisis story — it's a planning story. FSH is one of the hormones doctors look at when the conversation turns to menopause and ovarian health with age, which is part of why Ultra4™ tracks it alongside LH, E3G, and PdG instead of stopping at ovulation alone.
"I'm in my late thirties, and I want to have six, seven, maybe eight more kids. Mira's helping me do that without all the guesswork."
— Rumer Willis
84% of Mira users got pregnant within 6 cycles.*
Even with PCOS. Even with irregular cycles. Even when conception felt impossible.
Over 10,000+ 4.9/5-Star Reviews
Mira Hormone Monitor: Ultra4 Kit
Within 16 minutes you have your full hormone picture, at home; about the time it takes to make your coffee.
Tracks FSH, LH, E3G & PdG — the 4 hormones that build your fertile window
See your hormone patterns build in real numbers, cycle by cycle — not just a yes or no
Confirm ovulation happened, no more guesswork
Share your hormone data with your doctor at every appointment
Trusted by 300,000+ women in 115 countries.
Recommended by 5,000+ healthcare professionals.
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Questions, answered
No more guessing — here's exactly how Mira works.
What does Mira Ultra4™ track?
Four key reproductive hormones — LH, E3G, PdG, and FSH — as real numbers, once a day.
Is the setup really that simple?
Yes — dip your Mira Wand in the cup, insert into the Mira Monitor, wait 16-minutes and check your results in the app.
I'm not in a fertility crisis, just planning ahead — is this for me?
Yes. Ultra4™ is built for anyone who wants real hormone data instead of a guess, whatever stage of trying you're at.
Real Numbers.
Every Morning.
No Guesswork.
"This is what knowing your body actually looks like." — Rumer Willis
Mira Hormone Monitor and Ultra4™ Wands are intended for hormone monitoring and cycle tracking. Results are not intended to diagnose, screen for, or indicate PCOS, ovarian function, or any other medical condition. Mira does not diagnose, treat, cure, or prevent any disease, and is not a contraceptive device. Consult a doctor for all medical decisions. Always consult a qualified healthcare practitioner with questions regarding your health.
¹ Up to 99.5% detection accuracy for LH and PdG, based on internal laboratory testing under controlled conditions using known hormone concentrations. Reflects analytical performance, not clinical or real-world accuracy. Individual results may vary. Mira is not a diagnostic device.
² In a blinded clinical study comparing Mira hormone tracking with ultrasound monitoring, Mira identified ovulation within ±1 day in 96% of cycles.
*Based on the first STARD-compliant, blinded validation in over 25 years of a quantitative multi-hormone monitor against 890 ultrasound scans.
© 2026 Mira. Mira Ultra4™ is a trademark of Mira.