reference

Due Date Week-by-Week Timeline

Reverse pregnancy timeline from due date to LMP.

Working backward from your due date shows when each gestational week falls on the calendar. Useful for planning appointments and maternity leave.

Gestational week timeline relative to due date

Gestational Week	Days Before Due Date	Typical Events
4 weeks	252 days before	Positive pregnancy test possible
8 weeks	224 days before	First prenatal visit often scheduled
12 weeks	196 days before	End of first trimester
20 weeks	140 days before	Anatomy ultrasound
28 weeks	84 days before	Third trimester begins
32 weeks	56 days before	Bi-weekly visits may start
36 weeks	28 days before	Weekly visits; baby considered late-preterm at delivery
37 weeks	21 days before	Early term — delivery no longer preterm
40 weeks	Due date	Estimated due date (EDD)
42 weeks	14 days after	Post-term — induction often discussed

Frequently asked questions

Find your category or range in the table, then use the linked calculator to compute an exact value for your inputs.

Try the calculator