🎯 Trying to Conceive

Know your best days.
Track what matters.

Bloom's pregnancy planning dashboard gives you daily conception probability, ovulation confirmation, and AI-powered fertility insights — all based on your actual data.

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Daily Probability

Your real-time conception chance

Based on the Wilcox 1995 fertility study — the gold standard in conception probability research.

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Bayesian Model

Calculates probability using your cycle day position relative to estimated ovulation. Peak probability (33%) on ovulation day, tapering before and after.

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BBT Integration

Log your basal body temperature daily. Bloom validates readings (95–100°F range) and adjusts probability based on thermal shift proximity.

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Cervical Mucus Scoring

Track CM type (dry, sticky, creamy, watery, egg-white). Egg-white CM adds +30% to your probability — it's the strongest fertility indicator.

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OPK Results

Log ovulation predictor kit results (negative, positive, peak). A positive OPK adds +20% to probability. Peak adds +25%.

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Confidence Levels

Results show low/medium/high confidence. Limited data notice appears when fewer than 2 data points are logged this cycle.

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Cycle Variability Adjustment

Irregular cycles? The fertile window automatically widens. Bloom accounts for your cycle standard deviation when calculating probability.

Ovulation

Confirm ovulation — don't just guess

Bloom uses CUSUM change-point detection on your BBT data to confirm when ovulation actually happened.

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Thermal Shift Detection

Scans BBT readings for a sustained 0.15–0.6°F rise. Uses statistical scoring (shift magnitude × post-consistency / pre-variability) to find the most likely ovulation point.

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Multi-Signal Confirmation

Combines BBT thermal shift with cervical mucus patterns and OPK results. Multiple confirming signals = higher confidence in ovulation date.

Reports

Cycle-end conception reports

Every time a new cycle starts, Bloom auto-generates a report for the completed cycle.

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Timing Classification

Each intercourse entry is classified relative to ovulation: optimal (days -2 to 0), good (days -5 to -3), or low-probability.

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Overall Likelihood

Report shows your overall conception likelihood for that cycle: high, moderate, low, or none — based on the best-timed intercourse entry.

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Historical Archive

Last 12 cycle reports stored. Compare timing across cycles. See if your approach is improving over time.

AI + Preparation

Personalized guidance for your journey

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AI Fertility Insights

GPT-4o analyzes your fertility data — BBT patterns, CM trends, cycle regularity, intercourse timing — and generates personalized recommendations. Refreshes when new data is logged.

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Preconception Health Checklist

Track your preparation: folic acid supplementation, dental visit, blood tests, vaccinations, lifestyle changes, and more. Check items off as you complete them.

How Bloom calculates conception probability

Bloom uses a Bayesian probability model based on the Wilcox et al. 1995 fertility study to calculate daily conception probability. The base probability peaks at 33% on ovulation day and tapers to 10% at 5 days before ovulation. This base score is then adjusted by fertility indicators the user logs:

  • Egg-white cervical mucus: +30% boost
  • Positive OPK (LH surge): +20-25% boost
  • BBT thermal shift detected: -50% (ovulation already passed)
  • Irregular cycle history: wider fertile window applied

Ovulation is confirmed using CUSUM (Cumulative Sum) change-point detection on basal body temperature data. The algorithm looks for a sustained thermal shift of 0.15-0.6°F, scoring candidates by shift magnitude, post-shift consistency, and pre-shift variability.

At the end of each cycle, Bloom auto-generates a conception report that classifies each intercourse entry as optimal (days -2 to 0 from ovulation), good (days -5 to -3), or low-probability, giving users clear feedback on their timing.

Start planning your pregnancy today

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