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Week 17 of pregnancy — what is happening and what to do

Mamiqa Editorial Team · updated September 12, 2026 · 6 min read

Content pending medical review. This material was prepared by the Mamiqa editorial team based on publicly available guidelines; it is not yet indexed by search engines and we show no ads on it until it has been reviewed by a medically qualified person.

Week seventeen is a good moment to treat the second trimester as something to plan: appointments, tests and documents. In many facilities the anatomy scan slot is reserved in advance, and at popular imaging centers the slots go quickly. It is worth establishing now where you want the test done and preparing a single folder with all your documentation.

What to do in week 17

  • Book or confirm the anatomy scan date and put it in your calendar.
  • Complete your folder: pregnancy record, results, referrals, ID.
  • Write down three questions you want to ask at your next appointment.
  • Check with the facility whether the test requires any preparation.
  • Note the date of the first movement sensations in an app, if you already feel them.

How to plan the second trimester

The second trimester can be calmer, but it is exactly when several tests fall within specific time windows. A calendar works best: enter the planned check-ups, the approximate date of the anatomy scan, and the moment when you want to talk about blood tests. When the dates sit in one place, it is harder to miss a deadline.

  • Ask the clinic how they book the anatomy scan — by phone, online, or at an appointment.
  • Write down the reception number and the hours when it is easiest to get through.
  • Establish whether the test will take place at the clinic managing your pregnancy or at a separate imaging center.
  • Note which documents the facility asks you to prepare for the visit.

A document folder that saves time

It is worth having one folder that you take to every test and every appointment. In the office it is easy to forget where the results are, and the clinic often asks for documents lying at home. A simple folder with test reports makes every later appointment simpler and shortens the wait at reception.

  • Pregnancy record — take it to every appointment and every test.
  • Results of earlier tests and the report of the previous ultrasound.
  • Referrals, if the facility requires them.
  • A sheet with your questions — in the office it is easy to forget some of them.
  • Your ID and the phone number of someone who could pick you up.

When to start watching for the first movements

First movements appear at different times, depending on whether it is your first pregnancy, how the placenta is positioned, and how attuned you are to your own body. There is nothing to count or compare yet — the point is to notice what you feel. If you do not feel anything yet, say so at your next appointment.

  • Write down the date when you first feel a distinct movement.
  • Note the times of day when it is easier for you to feel movements.
  • Pay attention to the character of the sensations: a brush, a gurgle, a kick.
  • Do not compare what you feel with descriptions on the internet.

Everyday comfort in the second trimester

The second trimester is a good moment to adapt your surroundings to your growing belly. Many people feel more energetic then, but after sitting for a long time back stiffness appears, and after standing, a heaviness in the legs. A few small changes during the day reduce that tiredness and improve comfort at work.

  • Adjust your chair so your feet have support and your lower back is supported.
  • Take short breaks to stand up and stretch instead of sitting in one position.
  • Keep a bottle of water at work and reach for it regularly.
  • Choose shoes with flat soles — a steadier step takes strain off your spine.

Three questions written down in advance work better

In the office it is easy to forget the matters that seemed important before you walked in. A simple approach is to write your questions down earlier and limit their number, so the conversation does not turn into a checklist to tick off. Choose the ones concerning the coming weeks and order them from most to least important.

  • Write your questions the day before the visit, not in the waiting room.
  • Start with the matter that worries you most.
  • Leave blank space for answers and write them down right away in the office.
  • At the end, ask who to call, and at what number, if a doubt arises.
  • Move questions that went unanswered to the next appointment.

Tip

Keep a photo or scan of the ultrasound report together with your pregnancy record — it is easier to discuss the result at the next visit when the document is at hand.

When to contact a doctor

  • • Bleeding or spotting from the birth canal is a reason to contact your doctor or midwife.
  • • If severe, increasing lower abdominal pain appears, do not wait for the scheduled visit.
  • • With a fever, chills, or persistent vomiting, call the facility.
  • • In a life-threatening situation, call the emergency number.
  • • In a life-threatening situation, call 112.

When to call a doctor or midwife

  • • Bleeding or spotting from the birth canal.
  • • Severe, increasing abdominal pain, or pain localized on one side.
  • • Fever, chills, or persistent vomiting.
  • • Sudden weakness, fainting, or visual disturbances.

In a life-threatening situation call 112 or go to the nearest maternity hospital admission room — do not wait for a follow-up appointment.

Week 17 in detail

Week 17: how your baby is growing — Pomegranate

At seventeen weeks your baby is about the size of a pomegranate (around 130 mm). Brown fat tissue is starting to accumulate — a special type of fat that will help your baby stay warm after birth. The heart is working hard, pumping up to 24 liters of blood a day.

Development at week 17

  • Brown fat tissue is building up.
  • The heart pumps up to 24 liters of blood a day.
  • The sucking reflex grows stronger.

Tip

Midwife's tip: brown fat is your baby's 'blanket' after birth. Your diet and health support this development — keep up regular, nourishing meals.

Sources

  1. NHS — You and your baby at 17 weeks — www.nhs.uk/pregnancy/week-by-week/13-to-27-weeks/17-weeks-pregnant/
  2. Mayo Clinic — Pregnancy week by week — www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week

Week 17: what's happening in your body

At seventeen weeks the uterus is growing and rising upward, so your belly button may begin to flatten. You may also feel twinges in your groin — that's round ligament pain, from the ligaments stretching as they support your growing uterus.

Round ligament pain

  • It's a sharp, brief twinge on either side of the lower belly.
  • It worsens when you stand up quickly or cough.
  • It's a normal symptom — not a sign of a problem.

How to ease it

  • Change positions slowly.
  • Support your belly with a pillow while you sleep.
  • A warm bath can relax the muscles.

When to contact a doctor

  • • Severe, worsening, or constant lower abdominal pain with bleeding requires urgent medical attention.

Tip

Midwife's tip: from now on, a pregnancy pillow is a game changer — it supports your belly and takes pressure off your hips while you sleep.

Sources

  1. NHS — Common pregnancy symptoms — www.nhs.uk/pregnancy/related-conditions/common-symptoms/

Week 17: Fat tissue — what you can do today

Week seventeen is a good time to focus on sleep comfort. Your growing uterus is starting to make itself known, and sleeping on your left side improves circulation and comfort. It's also worth considering a pregnancy pillow.

Your tasks for this week

  • Switch to side sleeping — ideally on your left.
  • Consider a pregnancy pillow, or a regular pillow between your knees.
  • Change positions slowly to avoid ligament twinges.

Why the left side

  • It improves blood flow to the uterus and placenta.
  • It takes pressure off the inferior vena cava.
  • It reduces pressure on your internal organs.

Tip

Midwife's tip: don't stress if you wake up on your back — just roll back onto your side. Your comfort and sleep matter most.

Sources

  1. NHS — Sleep in pregnancy — www.nhs.uk/pregnancy/keeping-well/sleep/

Medical disclaimer

This article is educational in nature and does not replace advice from a doctor, midwife or other specialist. If in doubt, contact your attending physician.

This week is awaiting medical review: the page is not indexed and carries no ads until the content has been verified by a medically qualified person.

Sources

We base our content on these documents. Every medical claim in the guide is reflected in one of the publications below.

  1. NHS — "Your antenatal appointments" (visits and tests in pregnancy) — www.nhs.uk/pregnancy/your-pregnancy-care/your-antenatal-appointments/
  2. NHS — "Ultrasound scans" (ultrasound tests in pregnancy) — www.nhs.uk/pregnancy/your-pregnancy-care/ultrasound-scans/
  3. Ministry of Health — "Organizational standards of perinatal care" (regulation) — www.gov.pl/web/zdrowie/standard-organizacyjny-opieki-okoloporodowej
  4. NICE — "Antenatal care" (NG201) — www.nice.org.uk/guidance/ng201
  5. NHS — You and your baby at 17 weeks — www.nhs.uk/pregnancy/week-by-week/13-to-27-weeks/17-weeks-pregnant/
  6. Mayo Clinic — Pregnancy week by week — www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week
  7. NHS — Common pregnancy symptoms — www.nhs.uk/pregnancy/related-conditions/common-symptoms/
  8. NHS — Sleep in pregnancy — www.nhs.uk/pregnancy/keeping-well/sleep/

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