The short answer
5 weeks = 2 months
At 5 weeks pregnant, you are about 2 months pregnant — in month 2 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.
A missed period often brings the big discovery this week. The embryo’s heart is forming as a tiny tube and will soon begin to beat.
About the size of a sesame seed
size comparison
0.2 cm
crown to rump (0.1 in)
—
average weight
The embryo now looks like a tiny tadpole, with a distinct head end and tail end. Blood vessels are forming, and the first primitive blood cells are being made in the yolk sac. The neural tube is closing along its length, which is why folic acid matters most in these early weeks.
Sizes and weights are averages — healthy babies vary widely, and your scan measurements are what count.
A missed period is often the first real sign, and by now a test is usually clearly positive. Hormones are climbing fast, so tiredness, a heightened sense of smell and a strange metallic taste can all show up before you look any different. Needing to pee more often starts early because blood flow to the kidneys is already increasing.
Common symptoms this week
245
days to go
35
weeks to go
35
days so far
At 5 weeks 0 days you are 35 days into a 280-day pregnancy, which leaves 245 days — 35 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: 63 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 5 falls in month 2, 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 — 5+3 or 5w3d, 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 |
|---|---|---|---|
| 5 weeks 0 days (this page) | 5+0 | 35 | 245 |
| 5 weeks 1 day | 5+1 | 36 | 244 |
| 5 weeks 2 days | 5+2 | 37 | 243 |
| 5 weeks 3 days | 5+3 | 38 | 242 |
| 5 weeks 4 days | 5+4 | 39 | 241 |
| 5 weeks 5 days | 5+5 | 40 | 240 |
| 5 weeks 6 days | 5+6 | 41 | 239 |
At 5 weeks pregnant, you are about 2 months pregnant — in month 2 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.
5 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 35 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 5 weeks 0 days you are 35 days into a 280-day pregnancy, so there are 245 days left until the 40-week mark — that's 35 weeks. The count drops by one for each day you move through week 5.
5 weeks is 35 days, counted from the first day of your last menstrual period (5 × 7 = 35). Add the days into your current week for the exact figure — for example 5 weeks 3 days is 38 days.