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A June due date means conception in September to early October of the previous year. Find your exact date below.
When Did I Conceive If Due in June: If your due date is in June, you most likely conceived between September 8 and October 7 of the previous year — your due date minus 266 days. Due June 1 → conceived around September 8; due June 15 → around September 22; due June 30 → around October 7. Allow ±5 days for the fertile window.
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When Did I Conceive If Due in June — If your due date is in June, your likely conception date is your due date minus 266 days (38 weeks) — September 8 – October 7 of the previous year — with a ±5-day fertile window on either side.
Find your exact due date row in the table below for the likely conception date.
Or enter your due date in the calculator above for the exact, leap-year-aware answer.
Treat the result as a window: conception happens at ovulation, up to 5 days after intercourse.
If an ultrasound has revised your due date, use the revised date — it's the more accurate anchor.
Computed as due date − 266 days. The window column adds the ±5-day fertile window around the likely ovulation/conception day:
| Due date | Likely conception | Fertile window | Year |
|---|---|---|---|
| June 1 | Sep 8 | Sep 3 – Sep 13 | previous year |
| June 5 | Sep 12 | Sep 7 – Sep 17 | previous year |
| June 10 | Sep 17 | Sep 12 – Sep 22 | previous year |
| June 15 | Sep 22 | Sep 17 – Sep 27 | previous year |
| June 20 | Sep 27 | Sep 22 – Oct 2 | previous year |
| June 25 | Oct 2 | Sep 27 – Oct 7 | previous year |
| June 30 | Oct 7 | Oct 2 – Oct 12 | previous year |
Dates use a non-leap reference year and can shift by one day when the 266-day span crosses February 29 — the calculator above computes your exact dates.
A June due date puts conception in September or the first week of October of the previous year. Early autumn is one of the higher-conception periods in the northern hemisphere, so June is a busy birth month in many countries. Timeline-wise, this group's first trimester ran through the holiday season — the common 'we found out just before Christmas' story — with the anatomy scan in late January–February and a spring third trimester ending just as summer starts.
Medical Disclaimer
This calculator provides estimates only. Always consult with your healthcare provider for accurate pregnancy dating and medical advice.
Conception Date: The estimated date when fertilization occurred, typically 11-21 days after the first day of your last menstrual period.
Conception Range: A four-day timeframe during which fertilization most probably occurred, taking into consideration that sperm can remain viable in the reproductive tract for 3-5 days.
Gestational Age: The age of the pregnancy calculated from the first day of the last menstrual period, not the actual conception date.