Superbaby · Fertility planning

Your fertility, mapped with care.

A private, evidence-aware journey through timing, preconception health, safety and when professional support may help—followed by an optional evidence lab that never disguises association as certainty.

No fertility scoreNo diagnosisYour information stays on this device

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Primemester® evidence lab

See what seasonality can—and cannot—tell you.

Explore the published PRESTO latitude strata and a separate miscarriage study, then compare any apparent seasonal advantage with the real cost of waiting. Personal cycle timing remains more actionable than choosing a month.

Do not delay trying solely for a seasonal “best” month. Attempting now includes every future month in your opportunity set; waiting removes cycles. These observational outcomes remain separate and never enter a combined fertility score.

PRESTO latitude bandSelected · below 35° N

Published North American study strata. Similar latitude elsewhere does not prove the same seasonal pattern.

Visible evidence tracks

Fecundability Miscarriage Historical ASD context

ASD is off by default and never changes a recommendation.

Modelled fecundability peakNovember 22Below 35° N PRESTO stratum

Peak-to-low ratio1.4595% CI 1.14–1.84; relative, not absolute probability

Signal interpretationAbove noise rangePRESTO null simulations ranged from 1.00 to 1.18

12-month evidence wheel

A dimensional research instrument—not a ranking. Ring intensity reconstructs each study on its own scale; the selected latitude determines whether the apparent curve rises above the study’s noise range.

Research monthNovemberRotate through evidence—not destiny

Relative fecundability Miscarriage pattern ASD context · optional Planning runway

↑ model peak; only the southern stratum clearly exceeds the null-simulation range! late-August study peak; observational, not personal risk

Target conception month

Four-month Primemester® planning runway. This is a practical preparation horizon for folate, medication and vaccine review, health optimisation and sperm-related lead time—not a proven biological threshold and not a reason to delay if you are already trying.

Attempt-opportunity simulator

What does waiting for a “better” month cost?

This is arithmetic, not a pregnancy prediction. Enter a hypothetical per-cycle chance only to see how removing attempt cycles changes cumulative opportunity.

Month you could start

Month you would wait for

Hypothetical chance per attempted cycle: 20%Illustrative only; not estimated from your age or health.

Illustrative opportunity comparison over the next 12 monthsWaiting removes potential attempts

Fertile window

The useful conclusion is a window—not one magic day.

ASRM defines the fertile window as the five days before ovulation plus ovulation day. Calendar apps cannot locate that day reliably for every cycle.

−6outside core

−5core begins

−4rising

−3higher

−2Dunson model peak

−1Faust cohort peak

0ovulation estimate

+1very low

Dunson et al., 1999: after accounting for imperfect ovulation markers, the model’s highest estimate was approximately two days before ovulation. Exact probabilities depend on model and measurement.

Faust et al., 2019: in 225,596 app-recorded cycles, the highest estimate was one day before ovulation. The abstract does not establish universal 32% and 28% values; the executable conclusion is the six-day window.

Study scrutiny

What was corrected or kept outside the calculator.

Latitude peaks are published

The four dates and ratios match PRESTO Table III. Ratios for the three northern strata sit within or close to the study’s 1.00–1.18 null-simulation range, so their peaks are labelled uncertain rather than actionable.

Verified · primary paper

No composite “best month”

Fecundability, miscarriage and ASD differ in outcome, population and scale. Fecundability and early loss may also partly represent overlapping pathways, so they cannot be added into one score.

Safety rule · separate tracks

Birth-month overlays are excluded

School, sport and executive patterns are dominated by cutoff and selection effects. Subtracting nine months also ignores gestational-length variation and preterm birth.

Excluded from decision support

120 days is preparation—not a promise

The runway supports tasks needing lead time. It does not claim that completing a fixed program improves egg quality, sperm quality or offspring outcomes.

Planning horizon only

Superbaby · Primemester®

Research becomes action in your 120-day preparation protocol.

The calendar can inform timing, but it should end in preparation—not a promise about a “best” month. Primemester® converts your answers into a dated sequence of evidence-based tasks, clinician-review points and both-contributor preparation.