Due dates
How due dates are estimated, why they move, and which date to trust.
Last Period vs Conception Date: Which Due-Date Estimate Should You Trust?
How last-period and conception-date due-date estimates differ, and when a scan may become the main reference.
Why Very Few Babies Arrive Exactly on Their Due Date
A reassuring explanation of why due dates are estimates and why many healthy babies arrive earlier or later than the calculated day.
Why Your Due Date Changed After the First Ultrasound
A calm explanation of why clinics sometimes update your due date after early scans, and what it really means.
How Pregnancy Due Dates Are Calculated: LMP, Conception, IVF and Ultrasound
A complete guide to working out your EDD based on LMP, conception, IVF transfer or a dating scan, including cycle length adjustments and a method comparison table.
Which Date Should I Use in a Pregnancy Calculator?
Guidance on choosing between LMP, ultrasound, IVF transfer or known conception dates when using a pregnancy calculator, with reminders to follow your care team’s advice.
