Week 4
Implantation becomes established
Many pregnancy signs are still subtle, but the embryo is growing quickly.
Premium pregnancy tool
Pregnancy Due Date & Milestone Calculator
Estimate your expected due date, understand your current gestational age, and review important early pregnancy milestones in a polished, easy-to-use experience.
Designed for
English-speaking users worldwide
Core methods
LMP, conception, IVF, ultrasound
SEO ready
Schema, metadata, semantic HTML
Soft medical aesthetic
Warm, calming, and clinical enough for trust
Your result
The calculator updates the due date and gestational age after you press the button.
Estimated Due Date
—
Current gestational age
—
Status
Awaiting calculation
How the calculation works
LMP: adds 280 days, with a small adjustment for cycles other than 28 days.
Conception: adds 266 days from the conception date.
IVF: day-3 transfer adds 263 days, and day-5 transfer adds 261 days.
Ultrasound: reverses from scan-based gestational age to estimate the expected due date.
Timeline visual
Key milestones in early pregnancy
Milestones timeline
Week 6
Heartbeat may be detected
Ultrasound scans can sometimes reveal early cardiac activity around this time.
Week 9
First heartbeat milestone
A reassuring milestone for many families during early pregnancy care.
Week 12
End of the first trimester
Symptoms often begin to shift as the pregnancy enters a more stable phase.
Week 18
First fetal movement can be felt
Some parents may feel quickening for the first time around this period.
Week 20
Detailed anatomy scan
A key imaging milestone to evaluate growth and major structures.
Related pregnancy resources
Use the links below to keep browsing within the same site and maintain a strong internal-linking structure.
Why this layout works
The page keeps the calculator at the center, uses a single H1, applies semantic sections, and adds JSON-LD for search visibility. Images are loaded with Next.js `Image` and descriptive alt text for accessibility.