1 Months Pregnant — Weeks 1 to 4
Weeks 1–4 are counted before conception actually happens: the first two weeks are your period and the run-up to ovulation. In weeks that is 1 through 4, or days 7 to 34 of the 280-day count. The table below gives every week in the range with its fruit comparison and weight, so you can see exactly where the growth happens.
Week by week
| Week | Size | Weight | Trimester |
|---|---|---|---|
| 4 | a poppy seed | under 0.01 g | 1st |
Appointments in this stretch
No routine screening falls in this range.
Frequently asked
How many weeks is 1 months pregnant?
Weeks 1 to 4 — day 7 to day 34 of the 280-day count. Months are a convention rather than a medical unit: four weeks makes ten "months", which is why a 40-week pregnancy is described as nine months.
What trimester is month 1?
The 1st trimester throughout.
How big is the baby in month 1?
Not measured before week 4 and a poppy seed by the end. Weight goes from — to under 0.01 g across those weeks.