Pregnancy week 13: first trimester complete — the easiest stretch begins

A third of the road behind

Thirteen of forty — a third of the journey done, and the hardest third at that: the organ-building weeks, the nausea, the fear that shadowed every twinge.

What follows is, by the textbooks' own admission, the easiest phase. Nausea gone for most, energy back, the bump still light enough to ignore — and somewhere in it, the first flutter of movement.

So this week's real work is planning: whatever needs travelling, fixing, organising or celebrating sits easiest in the second trimester. Draft the list now; start next week.

Your baby this week

The baby is peach-sized — seven-plus centimetres, about twenty-five grams. Head-to-body proportions are improving quickly.

This week's loveliest construction: fingerprints. The whorls no one else on earth will ever share form in week thirteen.

Vocal cords are forming — the first cry in rehearsal. The intestines have completed their move into the abdomen, and the pancreas has started making insulin.

Changes in your body

Energy's return is the week's headline. Food looks good again, the afternoon fog lifts, and the household says 'the colour is back'.

Breast heaviness eases but growth continues — the old bras genuinely retire now. A well-fitted, wire-free bra is these months' cheapest comfort.

Increased white discharge is normal from here — the body's own infection defence. Green-yellow colour, itching or odour is different — that's for the doctor; plain white needs no treatment.

What to do this week

Draft the second-trimester list: travel (weeks 14-28 are the window), any household projects, and hospital-shortlisting if the delivery hospital isn't fixed.

Book the next routine visit — second-trimester visits typically run monthly. Weight, BP, urine every time; that trio is the visit, and that's normal.

If calcium was prescribed, take it apart from iron — they blunt each other's absorption. Common pairing: iron by day, calcium at night.

Start shifting sleep to the side — from the second trimester, side-sleeping (especially left) beats lying flat on the back. One thin pillow between the knees and one behind the back does what expensive pregnancy pillows do.

Week 13 at a glance

The week's essentials in one place. Your doctor may adjust these for your situation.

When to see a doctor at once

The standing list applies — bleeding, worsening pain, high fever, urinary burning. Discharge that is green-yellow, frothy or foul, or itches and burns, is an infection — treated in pregnancy as a necessity, not an option.

One new watch from here: one-sided calf swelling, redness and tenderness — clot risk (DVT) rises in pregnancy and this is its language. If seen, no massage — same-day doctor.

This article is general information only and no substitute for personal medical advice. The person who can advise you knowing your health, your medicines and your previous pregnancies is your obstetrician, or the doctor at your nearest health centre.

Work out your due date

Enter the first day of your last period and your cycle length — your estimated due date, this week's count and the anomaly scan window all appear right here.

It is only an estimate — most babies aren't born on the exact date. A first-trimester scan dates a pregnancy more accurately; in the end, your doctor's date is the one that counts.

Frequently asked questions