Week 10 of pregnancy: From Embryo to Fetus

Around the end of this week, doctors stop calling your baby an embryo and start using the word fetus. It marks a real milestone: most major structures have formed, and from here the main work is growth and maturation. For you, breast changes are often obvious and nausea may still be strong. This is also the earliest point for the NIPT blood test, and a good moment to decide which screening tests, if any, you want.

The 3.1 cm figure is a crown–rump length, measured from head to bottom; a typical range is about 3–4 cm. Some websites quote about 5 cm for week 10 because they count from conception rather than your last period, so do not worry if apps disagree.

Every pregnancy is different - you may have some, all or none of these.

Breast tenderness

Hormones enlarge the milk glands and ducts, which can make the breasts sore and sensitive to touch. A soft, supportive bra, including a comfortable one at night if it helps, usually eases this. Mention any new lump to your doctor.

Nausea and food aversions

Still common, and smells are a frequent trigger. Eating something plain before getting up and having small, frequent meals may help. Vomiting that stops you keeping fluids down needs a same-day call.

Tiredness

Often still marked until around 12–14 weeks. Short rests and an earlier bedtime help. If you also feel breathless or dizzy, ask whether your haemoglobin should be checked, as anaemia is common in pregnancy in India.

Emotional sensitivity

Hormone changes, tiredness and decisions about tests can leave you feeling on edge. Sharing worries with someone you trust helps, and so does writing down questions for your next appointment.

• NIPT (cell-free DNA test)

  Varies by provider

  From 10 weeks

  A blood test that looks at fragments of the baby's DNA in your blood. It is the most accurate screening test for Down's, Edwards' and Patau's syndromes, but it is still screening, not a diagnosis; a higher-chance or unclear result leads to counselling and the offer of a diagnostic test. In India it is private and self-paid; in the US it is offered to everyone, and in the UK usually after a higher-chance first result.

• Listening for the heartbeat

  Varies by provider

  Sometimes from 10 weeks, more often by 12

  Your doctor may try a hand-held Doppler at a visit. If the heartbeat is not heard yet, that is common this early, and a scan can confirm cardiac activity if there is any concern.

• Thyroid test (TSH)

  Commonly offered

  Usually at the first visit

  Many doctors in India check thyroid function early. Government guidance recommends it for people at higher risk, such as those with a past thyroid problem, a family history or living in an iodine-deficient area.

• Vitamin D

  Varies by provider

  UK: October to March; India: ask your doctor

  In the UK a daily vitamin D supplement is advised in autumn and winter, and all year for people who get little sun or have brown or black skin. In India there is no separate national advice, so ask your doctor whether you need a test or tablet.

Whether to have any screening test is your choice. Some people want as much information as possible, some choose only the combined test and some decline screening. Your doctor can talk through cost, timing and what each result would mean for you.

• 🌿Calcium builds your baby's bones and teeth and protects your own. Milk, dahi, chaas and paneer are the richest everyday sources, and India's dietary guidelines include milk or curd every day in pregnancy.
• 🌿If you avoid dairy, ragi as roti, dosa or porridge, til chutney or til laddoo, and green leafy vegetables such as palak, methi and amaranth all add calcium.
• 🌿Vitamin D helps your body use calcium. Deficiency is common in India despite the sunshine; ICMR suggests at least 15 minutes of direct sunlight, and your doctor may test your level.
• 🌿Use boiled or pasteurised milk, and buy paneer from a reliable source.

• •If nausea and tiredness make exercise feel impossible, count short walks. A few minutes on foot after each meal still adds up over a day, and fresh air can help with queasiness for some people.
• •A well-fitting sports bra makes movement more comfortable as your breasts grow and become tender.
• •Gentle stretches for the shoulders and upper back can ease the ache from heavier breasts. Keep breathing steadily throughout; breath-retention practices are not advised in pregnancy.

• •Home Dopplers are not a reliable way to check on your baby. This early the heartbeat is often too hard to find, which causes needless panic, and later a heartbeat heard at home can falsely reassure you when something needs checking.
• •Decide with your partner which screening tests you want before the 11–13 week window opens, and ask about cost if you are going privately.
• •If the pace of symptoms is wearing you down, remember that for most people nausea starts to improve by 13–14 weeks.

• ?Is NIPT worth considering for me, and what would it cost here?
• ?If I have NIPT, do I still need the NT scan?
• ?Should my vitamin D or thyroid levels be checked?
• ?Can you try to listen for the heartbeat at my next visit?

• Talk through screening choices with your partner
• Book the 11–13 week scan and blood test if you want them
• Get fitted for a supportive bra
• Step outside in daylight for a few minutes most days
• Add a calcium food to every meal