{"uid":"cap_Pcjq8UWF-t_ZS1bH8IeTc","slug":"saylor-innovations-pregnancy-due-date-calculator-2e972891","name":"Saylor Innovations Pregnancy Due Date Calculator","description":"Pregnancy due date by Naegele's rule from last period or conception with cycle adjustment, gestational age today, trimester and key milestone dates","url":"https://saylorinnovations.com/api/health/due-date?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["lmp"],"properties":{"lmp":{"type":"string","description":"First day of last menstrual period YYYY-MM-DD"},"today":{"type":"string","description":"optional reference date, default today"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["estimated_due_date","milestones"],"properties":{"note":{"type":"string","description":"Caveat or context for reading the result"},"source":{"type":"string","description":"Data source the values come from"},"milestones":{"type":"array","items":{"type":"object","properties":{"date":{"description":"Date (YYYY-MM-DD)"},"week":{"type":["number","null"],"description":"Gestational week"},"what":{"type":["string","null"],"description":"What typically happens"}}},"description":"Pregnancy milestones with week, date and what typically happens"},"days_until_due":{"type":"number","description":"Days until due"},"trimester_today":{"type":"number","description":"Trimester today"},"percent_complete":{"type":"number","description":"Percent complete"},"estimated_due_date":{"type":"string","description":"Estimated due date"},"conception_estimate":{"type":"string","description":"Conception estimate"},"cycle_adjustment_days":{"type":["number","null"],"description":"Cycle adjustment days"},"gestational_age_today":{"type":["object","null"],"properties":{"days":{"type":["number","null"],"description":"Number of days"},"text":{"type":["string","null"],"description":"Text content"},"weeks":{"type":["number","null"],"description":"Completed gestational weeks today"}},"description":"Gestational age today"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2mN1xv7odGmRS5zy5lJ5I","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates pregnancy due date using Naegele's rule from last menstrual period, along with gestational age, trimester, and key milestone dates","exampleAgentPrompt":"My last period started on March 15th 2025 — can you calculate my pregnancy due date, tell me what trimester I'm in today, and give me the key milestone dates?","exampleUseCases":[{"title":"First-trimester due date check","prompt":"I just found out I'm pregnant! My last menstrual period started on February 3rd 2025 — can you figure out my due date using Naegele's rule, tell me how many weeks along I am, and show me the important milestone dates?"},{"title":"Gestational age progress tracking","prompt":"My LMP was November 10th 2024. What trimester am I in now, how far along am I in weeks and days, and what percentage of the pregnancy is complete?"},{"title":"Conception date estimation","prompt":"Can you work out when I likely conceived? My last period started on January 20th 2025 and I have a 32-day cycle, so please adjust for that when calculating my due date and conception window."}],"resultDescription":"Returns the estimated due date (YYYY-MM-DD), conception estimate, gestational age in weeks and days with a text description, current trimester number, percentage of pregnancy complete, days until due date, cycle adjustment days applied, and an array of key pregnancy milestones each with gestational week, date, and a description of what typically happens at that stage. Also includes a source attribution and contextual note.","failureModes":["Missing required lmp parameter returns an error","Malformed date format for lmp or today causes a parsing error","Future LMP date or LMP more than ~42 weeks ago may produce out-of-range or clinically implausible results","Invalid query parameter types may return a 400 error","Service unavailability or x402 payment failure returns a non-200 response"],"whenToPreferThis":"Choose this endpoint when you need a quick, rules-based obstetric due date calculation (Naegele's rule) with cycle-length adjustment, gestational age breakdown, trimester identification, and structured milestone dates — all in one call. Prefer it over building custom date arithmetic when you need clinically-grounded pregnancy timeline data without integrating a full EHR system.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T12:56:22.638Z","isFirstParty":false,"canonicalSlug":"saylor-innovations-pregnancy-due-date-calculator-2e972891"}