Pregnancy week 10: symptoms, ultrasound and baby size
Pregnancy week 10 marks a beautiful milestone: your baby is about 31 millimetres long, the size of a strawberry, and stops being an embryo to become a fetus. It’s also one of the most intense weeks of the first trimester, because hCG and progesterone are still running high. I know tiredness and nausea can take it out of you, but I promise it’s worth holding on: you’re close to feeling much better. Let me tell you everything that’s happening inside.
If you’re coming from pregnancy week 9, this week is the natural continuation of everything I told you there. And for the full journey, see our pregnancy week by week guide.
What is pregnancy week 10?
Pregnancy weeks are always counted from the first day of your last period (LMP), not from conception. That means in week 10 you’re about 8 weeks from fertilisation, still within your third month (weeks 9–13) and in the final stretch of the first trimester.
It’s a big transition week: the embryo is finishing its most delicate stage and, right around now, many professionals start calling it a fetus. It’s simply a change of name, because development is continuous, but it marks the moment when the main organs are already formed and it’s now about growing and maturing them through the rest of the pregnancy.
It’s also key for another reason: by the end of this week the placenta is ready to take over producing the pregnancy hormones. That handover from the corpus luteum to the placenta is often behind why nausea peaks right now and starts easing afterwards.
What can you see on the week 10 scan?
If you have an ultrasound in week 10, quite a lot is already visible:
- A baby about 3 centimetres long from head to tail, in an increasingly human shape.
- A strong, fast heartbeat: around 170 beats per minute, almost the fastest it will ever be.
- Arms and legs moving in small spontaneous movements, because the joints are working.
- The mouth opening and closing and the start of small facial gestures.
- Hands and feet with the fingers separating (they no longer look like paddles).
If you haven’t taken a pregnancy test yet, hCG levels are at a very high point this week and any test is very reliable. You can take our free online pregnancy test to reflect on your symptoms, and if you fancy a distraction, try our finger pregnancy test game: it’s just a game, not a real test.
What symptoms are normal in week 10?
The first trimester doesn’t give much let-up, and week 10 is usually one of the most intense. It’s normal to notice:
- Nausea, with or without vomiting: usually at its peak (between weeks 8 and 10). Eating little and often helps a lot.
- Tiredness and sleepiness: progesterone is still high. Give yourself permission to rest.
- Heavy, tender breasts, with areolas that may be darker or larger: one of the most common complaints.
- Heartburn and heavy digestion: hormones relax the stomach valve, so food comes back up more easily.
- Frequent urge to urinate: your uterus is pressing on your bladder.
- Constipation and bloating: your digestion has slowed down. Drink water and eat fibre.
- A light pressure low in the pelvis: the ligaments are stretching to support the uterus.
- Mood swings and emotional sensitivity: hormones are going full speed, it’s completely expected.
Hardly any symptoms? That’s also completely normal: every pregnancy is unique and every body reacts differently. Feeling little doesn’t mean anything is wrong.
How big is the baby in week 10?
The baby in week 10 measures about 31 millimetres (around 3 centimetres): the size of a strawberry, and weighs barely 4–5 grams. But although it’s tiny, this week is full of progress:
- It stops being an embryo and becomes a fetus: the main organs are formed and from now on they grow and mature.
- The intestines, which until now developed inside the umbilical cord, begin moving into their final place in the abdomen.
- The beginnings of fingernails and toenails appear.
- The brain develops millions of new neurons every day, and your baby makes gestures, opens its mouth or touches its face.
- The kidneys are working and making urine, which goes into the amniotic fluid.
- The heart beats at around 170 beats per minute, near its highest point of the whole pregnancy.
- Fingerprints begin to take shape.
Your uterus, meanwhile, is already the size of a grapefruit, and you may feel more pressure low in your belly, even if your bump barely shows from the outside: what you notice most is bloating.
Tips for week 10
- Think ahead to the nuchal translucency scan: the first-trimester combined screening is usually done between weeks 11 and 13. If yours is coming up, use the chance to ask all your questions.
- Keep taking folic acid: still essential for nervous system development. I explain everything in folic acid in pregnancy.
- Ease heartburn: eat small meals, avoid fried and spicy food, and don’t lie down right after eating.
- Watch out for constipation: drink plenty of water, eat fibre and keep moving gently.
- Eat little and often for nausea and avoid raw foods, alcohol and smoking.
- Don’t self-medicate: always ask your doctor before taking anything, even for heartburn or headaches.
- Work out your due date with the gestogram and track your week with how many weeks pregnant am I.
If you have intense one-sided pain, heavy bleeding or a fever, contact your doctor promptly.
FAQ
What month am I in during week 10? You’re in your third month: weeks 9–13 make up month 3. Counting starts on the first day of your last period, not the day of conception.
How big is the baby in week 10? About 31 millimetres (3 centimetres), the size of a strawberry, weighing barely 4–5 grams. The fingers, forming nails and an increasingly human face are already visible.
When does the embryo become a fetus? Right around this week: around week 10 the baby starts being called a fetus. It’s just a change of name, development is continuous.
Is my bump already showing in week 10? Not much from the outside: your uterus is the size of a grapefruit, but what you mostly feel is bloating and pressure. Don’t worry if nothing shows yet.
Can I feel the baby move in week 10? Not yet: although it moves a lot, it’s too small for you to notice. The first sensations of movement usually arrive between weeks 18 and 22.
When will the nausea end? Even if it feels endless, it usually starts to ease after week 12. This week’s placenta-hormone handover is often the beginning of the improvement.
Is the first trimester almost over? Almost: there are a few weeks left. The first trimester runs until week 13, so you’re in its final stretch and close to feeling more energetic.
Remember this article is for information only. If you have questions about your health or think you may be pregnant, talk to your doctor. They can advise on the right tests and support you through this special time ❤️.
