Why we exist
We didn't build FertilityFlow. Our marriage did.
Every home where a couple chooses to stay, to understand each other, and to build something together — that home changes the world. NatProFam exists because Arek and Monika believe this. Not as theory. As 19 years of lived experience.
Arkadiusz (Arek) Dowejko
Co-founder · Software Engineer · Husband
Over 12 years as a software engineer, now building FertilityFlow. Podcaster and content creator on marriage — not as a therapist, but as a husband who spent nearly two decades studying what actually makes marriage work.
For most of his adult life, something felt off. Desk job, screens, weekends on the sofa. Moving to Poland shifted the mode: less screen time, more presence — at home, with family, with his hands in the work. He's renovating the house, chopping wood, riding a motorbike. Not as hobbies — as a way of actually being here.
He identifies with the autism spectrum (no formal diagnosis), which gives him a particular appreciation for clear, well-structured systems — and makes marriage to Monika a daily lesson in communication and flexibility. He spent 20 years in the UK. He brought his family back to Poland because he decided it was time to live with purpose.
Dr. Monika Dowejko
Co-founder · PhD in Reproductive Endocrinology · Certified FAM Instructor · Wife
Her PhD in reproductive endocrinology didn't begin in a laboratory. It began with 10 years of living with PMOS (formerly PCOS), with monthly disappointments, with adoption papers prepared and a pregnancy they didn't expect. She didn't just study fertility. She lived it.
She is a certified FAM/NFP instructor who trains other instructors online and does individual consultations with couples. She is not a medical doctor. She is a scientist, educator, and mother who teaches from 19 years of partnership — not from a manual.
When she discovered that FAM wasn't just about tracking cycles but about reclaiming agency over your body and your marriage, everything changed. She listens: to couples struggling to conceive, to women coming off hormonal contraception for the first time, to husbands learning to read their partner's cycle. She doesn't teach rules. She teaches understanding.
What we believe
Marriage is not a private arrangement between two people. It is the foundational unit of a healthy society. The renewal of culture doesn't start with politics or large institutions. It starts in the bedroom and at the kitchen table — in every individual home.
The family is the first society
The home is where children learn to relate, to forgive, to take responsibility, and to cooperate. What they experience there shapes how they behave everywhere else. A strong home produces strong people.
Healthy marriages heal culture
The deepest social crises of our time — loneliness, emotional instability, relational breakdown — are not solved by programmes or policies. They are solved one marriage at a time.
A strong marriage doesn't stop at the front door
It inspires the couple across the street. It anchors local networks. It builds the kind of trust between people that no institution can manufacture top-down.
This is a counter-cultural act
Modern culture promotes individualism. NatProFam promotes commitment — not because it is easy, but because lasting dedication to another person, and to the common good, is what actual civilisation is built on.
This is why FertilityFlow exists. Not to track cycles. To give couples the knowledge they need to understand each other more deeply — because a couple that knows each other better stays together better. And a couple that stays together better makes the world better, one home at a time.
Nineteen years of proof
Arek and Monika's story is not backstory. It is evidence that the mission is livable.
They married in 2008. Small wedding — about 20 people, a simple meal, then a few friends at home. They remember every minute of it because it was calm and unhurried. The first years brought multiple countries, no stable income, and no family nearby. They built their systems for marriage to work before they had the luxury of comfort.
Then came ten years of trying to start a family. Monika has PMOS. They went through fertility assessments, the weight of monthly disappointments, and eventually started the adoption process. Their first son was born naturally, while the adoption papers were already prepared. Their rule was simple: us against the problem, not me against you.
Their second son was born during the COVID pandemic — 1,488 km from family, no outside help, just the two of them. Monika developed postnatal depression. When she said "I can't cope," Arek took both children on walks for two hours. Every evening after the kids slept, he asked: "What was hardest today?" and "What can I do differently tomorrow?" It took six months. They got through it through prayer and by showing up for each other every day.
Arek also lost his job — in difficult circumstances, with two children and a mortgage. Same approach: us against the financial crisis. Weekly honest check-ins without panic or blame. Arek started his own business. He's happier now than he was as an employee.
Through all of it — infertility, depression, crisis, recovery — they practised natural family planning together for 19 years. Arek didn't just follow instructions. When Monika said "I don't want you to just follow my cycle — I want you to understand it," he started paying attention. He noticed patterns in her energy, mood, and needs. Biology became a shared language.
What they built — and why
After years of running pre-marriage courses in their parish, and questions we received from couples about fertility, bodies, and how to navigate intimacy and family planning without compromising their values — Arek and Monika realised the tool didn't exist.
Most fertility apps are built for women. They treat the partner as an afterthought — a checkbox, a notification, a secondary profile. They're built by technology teams who understand cycles as data, not as lived experience shared between two people.
FertilityFlow is different because the people who built it have been living this for nearly two decades. Monika's PhD in reproductive endocrinology means the content is built on peer-reviewed science. Arek's 12 years of engineering means it actually works. And 19 years of doing this as a couple meant they were designing for two people from the start, not one.
Who FertilityFlow is for
FertilityFlow is for couples. Couples are the unit of design. Every feature was built with both partners in mind.
Couples trying to understand their natural fertility for the first time
Couples trying to conceive who want to track the right signs
Couples who want to avoid pregnancy naturally without hormonal contraception
Couples going through fertility challenges alongside medical care
Couples who have practised NFP before and want a better tool
Young women beginning to understand their cycles
If you heard about us on the radio, on a podcast, or through someone who knows us — welcome. This is the real story. We're a married couple who built the tool we wished we'd had, not a startup that spotted a market opportunity.
What FertilityFlow actually is
FertilityFlow helps couples track and understand fertility using three evidence-based signs: Basal Body Temperature (BBT), Cervical Mucus, and Menstrual Flow. These are the methods Monika teaches and has used personally for 19 years. AI helps you interpret the patterns. The partner portal means both of you can see what's happening in real time.
FertilityFlow is not a medical device. It does not diagnose. It does not replace a doctor or a certified instructor. It is a clear, honest educational tool that helps couples build cycle awareness together.
Begin. Together.
Start for free. No credit card. No commitment. Just a clearer picture of your cycle — and a new shared language for your relationship.