The short answer
12 weeks = 3 months
At 12 weeks pregnant, you are about 3 months pregnant — in month 3 of your pregnancy and in your first trimester.
Not sure of your week? Use the pregnancy week calculator to find it from your last period, due date or conception date.
Reflexes are developing and the nuchal translucency scan window is here. Many people share their news around now, as the first trimester nears its end.
About the size of a lime
size comparison
5.4 cm
crown to rump (2.1 in)
14 g
average weight (0.5 oz)
The intestines have moved back into the abdomen from the umbilical cord, and the pituitary gland is beginning to make hormones. Bone marrow is starting to produce white blood cells, and the fingers can open and close. Facial features are settling into place: eyes closer together, ears in position and a clearly defined chin.
Sizes and weights are averages — healthy babies vary widely, and your scan measurements are what count.
The uterus rises out of the pelvis around now, so your provider can usually feel the top of it just above the pubic bone. Frequent urination often improves as pressure on the bladder eases. Energy typically begins to creep back, and the risk of miscarriage falls noticeably once a heartbeat has been seen at this stage.
Common symptoms this week
196
days to go
28
weeks to go
84
days so far
At 12 weeks 0 days you are 84 days into a 280-day pregnancy, which leaves 196 days — 28 weeks — until 40 weeks. That number drops by one for every day you move through this week. Remember the due date is an estimate: only about 1 in 20 babies is born on it, and most arrive within two weeks on either side.
Next milestone: 14 days until the second trimester (14 weeks 0 days).
A calendar month averages about 4.3 weeks — not 4 — so you can't just divide your week number by four. Instead, months of pregnancy are counted as uneven buckets of 4 to 5 weeks, arranged so the full 40 weeks fits into 9 calendar months. Week 12 falls in month 3, in the first trimester.
Your care team will always use weeks and days rather than months, because screening windows and term definitions are set by exact week — months are just the everyday shorthand. For the full conversion, see the weeks to months chart, or go the other way with the months-to-weeks guide.
Your notes will show a week and a day — 12+3 or 12w3d, for example. Pick the exact day you are on for its own day count, countdown and month answer.
| Week + day | Shorthand | Days pregnant | Days to go |
|---|---|---|---|
| 12 weeks 0 days (this page) | 12+0 | 84 | 196 |
| 12 weeks 1 day | 12+1 | 85 | 195 |
| 12 weeks 2 days | 12+2 | 86 | 194 |
| 12 weeks 3 days | 12+3 | 87 | 193 |
| 12 weeks 4 days | 12+4 | 88 | 192 |
| 12 weeks 5 days | 12+5 | 89 | 191 |
| 12 weeks 6 days | 12+6 | 90 | 190 |
At 12 weeks pregnant, you are about 3 months pregnant — in month 3 of your pregnancy and in your first trimester. Months of pregnancy are counted as uneven 4–5 week buckets so that the full 40 weeks fits into 9 calendar months.
12 weeks is in the first trimester, which runs from week 0 through 13 weeks 6 days. The second trimester begins at 14 weeks 0 days.
About 28 weeks until the 40-week mark — though only about 1 in 20 babies arrives exactly on the due date. Most are born within two weeks on either side of it.
At 12 weeks 0 days you are 84 days into a 280-day pregnancy, so there are 196 days left until the 40-week mark — that's 28 weeks. The count drops by one for each day you move through week 12.
12 weeks is 84 days, counted from the first day of your last menstrual period (12 × 7 = 84). Add the days into your current week for the exact figure — for example 12 weeks 3 days is 87 days.