Due in September 2027: when did I conceive?
If your baby is due in September 2027, you most likely conceived between December 9, 2026 and January 7, 2027. Find your due date in the table.
Conception date for every due date in September 2027
| Due date | Conceived | Last period started |
|---|---|---|
| Sep 1 | Dec 9, 2026 | Nov 25, 2026 |
| Sep 2 | Dec 10, 2026 | Nov 26, 2026 |
| Sep 3 | Dec 11, 2026 | Nov 27, 2026 |
| Sep 4 | Dec 12, 2026 | Nov 28, 2026 |
| Sep 5 | Dec 13, 2026 | Nov 29, 2026 |
| Sep 6 | Dec 14, 2026 | Nov 30, 2026 |
| Sep 7 | Dec 15, 2026 | Dec 1, 2026 |
| Sep 8 | Dec 16, 2026 | Dec 2, 2026 |
| Sep 9 | Dec 17, 2026 | Dec 3, 2026 |
| Sep 10 | Dec 18, 2026 | Dec 4, 2026 |
| Sep 11 | Dec 19, 2026 | Dec 5, 2026 |
| Sep 12 | Dec 20, 2026 | Dec 6, 2026 |
| Sep 13 | Dec 21, 2026 | Dec 7, 2026 |
| Sep 14 | Dec 22, 2026 | Dec 8, 2026 |
| Sep 15 | Dec 23, 2026 | Dec 9, 2026 |
| Sep 16 | Dec 24, 2026 | Dec 10, 2026 |
| Sep 17 | Dec 25, 2026 | Dec 11, 2026 |
| Sep 18 | Dec 26, 2026 | Dec 12, 2026 |
| Sep 19 | Dec 27, 2026 | Dec 13, 2026 |
| Sep 20 | Dec 28, 2026 | Dec 14, 2026 |
| Sep 21 | Dec 29, 2026 | Dec 15, 2026 |
| Sep 22 | Dec 30, 2026 | Dec 16, 2026 |
| Sep 23 | Dec 31, 2026 | Dec 17, 2026 |
| Sep 24 | Jan 1, 2027 | Dec 18, 2026 |
| Sep 25 | Jan 2, 2027 | Dec 19, 2026 |
| Sep 26 | Jan 3, 2027 | Dec 20, 2026 |
| Sep 27 | Jan 4, 2027 | Dec 21, 2026 |
| Sep 28 | Jan 5, 2027 | Dec 22, 2026 |
| Sep 29 | Jan 6, 2027 | Dec 23, 2026 |
| Sep 30 | Jan 7, 2027 | Dec 24, 2026 |
These are estimates: conception usually happens around ovulation, and babies arrive at different times. An early ultrasound gives the most accurate dates.
Key dates for a pregnancy from the middle of September 2027
- Nuchal translucency (NT) scan window: Feb 25 – Mar 17, 2027
- Anatomy scan window: Apr 15 – May 19, 2027
- Third trimester begins: Jun 24, 2027
- Full term: Sep 9 – 22, 2027
About September 2027
Babies due in September 2027 were mostly conceived in winter in the northern half of the world (summer in the southern half).
Questions about a September 2027 due date
If I’m due in September 2027, when did I conceive?
Most likely between December 9, 2026 and January 7, 2027, about 38 weeks (266 days) before each due date. Find your due date in the table above to see your day (ACOG).
When did my last period start if I’m due in September 2027?
About 280 days (40 weeks) before the due date: between November 25, 2026 and December 24, 2026. For example, a due date of September 16, 2027 means the last period started around December 10, 2026 (ACOG).
If I’m due on September 16, 2027, did I conceive on December 24, 2026?
Not always on that exact day. Conception usually happens around ovulation, and ovulation can come earlier or later in a cycle. An early ultrasound gives the most accurate dates, so ask your midwife or doctor (ACOG).