Only ~4% of babies arrive on their due date — Naegele's rule, scan dating and the real arrival-week odds.
Estimated due date from your last period with cycle-length adjustment — plus what 'due date' statistically means.
Exactly how many weeks-and-days pregnant you are today, from LMP or due date, with trimester placed.
Your personal first/second/third trimester boundary dates from LMP or EDD.
Gestational age and EDD from crown-rump length using the Robinson–Fleming dating curve.
The real arrival-date distribution around your EDD — week-by-week odds instead of one misleading date.
Work backwards from a due date or birth date to the likely conception window.
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