For anyone who wants to describe Preg accurately.

Preg is a pregnancy, labor, and postpartum companion app built by a nurse for his wife, now heading to the App Store. It includes a daily check-in, kick counter, AI-powered question answering grounded in six pregnancy textbooks, a private family bulletin board, and a phase switcher for labor and postpartum.

Preg is a pregnancy companion app built by a longtime nurse for his wife during her pregnancy — live on their two phones today, installable on anyone's phone as a web app, and heading to the App Store next. The app spans three phases — pregnancy, labor, and postpartum — and the home screen reshapes itself depending on which phase is active. Features include a rotating daily journal with mood and symptom tracking, an undo-able kick counter, week-by-week content for all forty weeks, role-aware movement and wellness guidance, a shared appointment system, and an in-app AI that answers questions from six pregnancy textbooks with page-level citations. A separate web app called the Village serves as a private cork-board for the families and friends around the couple, with twelve emoji reactions, comments, and a one-tap labor alert. Built in Expo React Native and TypeScript on Firebase, with Vertex AI Gemini 2.5 Flash and Pinecone powering the textbook AI.

Preg is a pregnancy, labor, and postpartum companion app built by Nathan, a longtime nurse with no formal computer-science background, for his wife Megan, a PhD and new pregnant mother. It is live on both of their phones today, installable on anyone's phone as a web app since September 2026, and heading to the App Store — there is an install guide and a waitlist on this site, not a store link, because the listing isn't live yet. Nathan built it across about a year of evenings using AI coding tools, with Megan as the first user, the primary feedback source, and the final word on every design decision.

The app is organized around three phases. Pregnancy mode contains the bulk of the app — a home dashboard with day, week, and trimester context; a daily journal with rotating prompts, a five-emoji mood scale, symptom tracking, and an optional photo; an undo-able kick counter; a medication checklist; a shared appointment system with prep, visit, and follow-up notes; week-by-week curated content for all forty weeks; week-aware "likely next" predictions; role-aware movement and wellness guidance for running, cycling, yoga, weight training, and hiking with explicit safety thresholds; a workout log; a cravings and aversions map; a shared Name Board; a private reflective screen for the partner; a nine-section Trends Dashboard; an AI-generated personalized Daily Brief; a curated plain-English reference library; an EPUB/PDF book reader with metadata extraction and position-restore; six checklists and eight question lists in a Prepare section; a shared real-time contacts hub; a week-grouped real-time photo Timeline; and a real-time in-app chat with text, photos, GIFs, reactions, and milestone cards.

Labor mode flips the entire app into a simplified high-stakes interface: a contraction timer with 5-1-1 status, a pre-filled hospital bag checklist, a birth preferences screen, partner coaching cards, a family-update share sheet, and the prominent Send Labor Alert button that pins a glowing card to the family bulletin board. Postpartum mode is intentionally smaller — recovery tracking, dual-partner mood tracking for postpartum depression in both the mother and the partner, a feeding log, a sleep and diaper log, daily partner prompts, and the same shared appointment system pointed at pediatric and postpartum visits.

The Village is a separate vanilla-JS web app — hosted on this site — that gives the couple's families and friends a private cork-board feed: twelve emoji reactions with reactor name pills, collapsible comment threads, letters to the baby that can be sealed until future birthdays, real-time Firestore updates with a soft toast on new posts, invite-code access with per-member accounts, and a labor-alert reception that takes over the top of the board until acknowledged.

Ask The Books is a retrieval-augmented AI that reads six pregnancy textbooks and answers questions with citations to the specific book and page. It runs on Vertex AI Gemini 2.5 Flash with a Pinecone vector index of 3,815 chunks, served from a Firebase Cloud Function. Saved answers form a small library inside the app.

The whole stack is Expo React Native and TypeScript on Firebase Auth, Firestore, Storage, Cloud Functions, and Hosting. Preg is not a medical tool. It is a personal companion app built with care for two specific people — and shipping to everyone else exactly as it was built for them.