6 Weeks Pregnant — Baby Is the Size of a Sweet pea
At 6 weeks you are 42 days into the 40-week count, with 238 days to go and 15% of the pregnancy behind you. Baby is about the size of a sweet pea and weighs about 0.05 g. This page fixes week 6 in place: what is developing, which appointments are still ahead, and how the week maps onto months.
15% of 280 days. The due date itself is a midpoint, not a deadline: full-term births spread across roughly weeks 37 to 42.
This week
A thin beating tube that will become the heart starts pulsing. At many scans this is when it's first glimpsed.
Measured in months, week 6 sits in month 2: Month two is when a missed period turns into a positive test, and the neural tube closes while you may feel nothing at all.
Appointments still ahead
| Window | Appointment | What it checks |
|---|---|---|
| 8–12 wks | Booking appointment | First scan confirms the pregnancy, due date and heartbeat. |
| 11–13 wks | NT scan (combined test) | Checks nuchal translucency and screens for chromosomal conditions. |
| 15–20 wks | Quad / anomaly blood screen | Optional blood test for screening risk factors. |
| 18–22 wks | Anatomy scan | Detailed look at baby's organs, limbs and growth — often the sex reveal. |
| 24–28 wks | Glucose tolerance test | Screens for gestational diabetes. |
| 28–34 wks | Routine growth checks | Regular midwife visits, bump measurements and blood pressure. |
| 34–36 wks | Group B strep swab | A simple swab that protects the baby during delivery. |
| 37–40 wks | Weekly checkups | Position checks, growth checks and the birth plan in earnest. |
Around week 6
| Week | Size | Weight |
|---|---|---|
| 5 | an apple seed | under 0.01 g |
| 6 | a sweet pea | about 0.05 g |
| 7 | a blueberry | about 0.1 g |
Frequently asked
What does 6 weeks pregnant mean in days and months?
6 weeks is 42 days since the first day of your last period, which is about 2 months pregnant on the four-week-per-month convention. 238 days remain in the 40-week count from here — that is 15% of the way through.
How big is a baby at 6 weeks?
Around the size of a sweet pea, at about 0.05 g. These are population averages: a scan measurement that differs by a few days is normal and does not by itself mean anything is wrong.
Which trimester is week 6?
The 1st trimester. The split used here is the same one the calculator applies: the first trimester covers days 1–90, the second 91–195, and the third from day 196 onward. Other sources draw the boundary a week either side, which is why week 13 and week 14 can both be described as "end of the first trimester".
What appointments happen after week 6?
Next up: Booking appointment at 8–12 weeks, NT scan (combined test) at 11–13 weeks, Quad / anomaly blood screen at 15–20 weeks. The full schedule is in the table above; exact timing varies by country and by your care team.