10 weeks pregnant

How big is your baby at 10 weeks?

About the size of a small apricot — around 30 mm (1.2 in) long from head to bottom. Past an inch for the first time.

A note on the numbers: in the first trimester babies are measured crown to rump — head to bottom, not head to heel, because the legs are curled. Weight is not reliably estimated this early, so any site quoting grams or ounces before about 14 weeks is guessing.

What's developing this week

Another significant growth spurt. The head is still too big for the body, but the face is much more recognisably in proportion. The eyes are half closed and can react to light. The ears are starting to form, the mouth has a delicate upper lip and the nose has two nostrils. The jawbone is shaping up and already contains tiny versions of the milk teeth.

The heart is beating extremely fast — the NHS gives 180 beats per minute, roughly three times an adult resting rate. That is normal, not alarming. The baby is making jerky movements that can be seen on a scan, although you will not feel anything for many weeks yet.

What you might feel

The NHS list for week 10 adds indigestion, heartburn and dizziness to the familiar set: extreme tiredness, nausea, mood swings, a metallic taste, sore breasts, headaches, changed food preferences, a heightened sense of smell, discharge, light spotting, cramping, darkened patches on the face, greasier skin, thicker hair and bloating.

Indigestion and reflux often start now because pregnancy hormones relax the valve at the top of the stomach. Smaller meals, sitting up after eating, and cutting back on coffee and rich or spicy food help more than most people expect. Bloating is common enough that the NHS points people to week 10 for advice on it — it is not a bump yet, whatever it feels like in your clothes.

Is 10 weeks pregnant 2 months or 3 months?

Week 10 is in month 3, its second week. Two and a half months along in calendar terms.

There is no official weeks-to-months map. A calendar month averages about 4.3 weeks, not 4, so 40 weeks is a little over nine months — and two apps can disagree about which month you are in. The most widely used mapping:

• Month 1 — weeks 1 to 4
• Month 2 — weeks 5 to 8
• Month 3 — weeks 9 to 13
• Month 4 — weeks 14 to 17
• Month 5 — weeks 18 to 22
• Month 6 — weeks 23 to 27
• Month 7 — weeks 28 to 31
• Month 8 — weeks 32 to 35
• Month 9 — weeks 36 to 40

Your maternity team will not use months. Everything is booked by week and day — "11 weeks and 3 days" — because a few days change what is offered.

Miscarriage risk at 10 weeks

Week 10 is the last of the three heartbeat milestones, and the strongest. In a study of over 300 women with a history of recurrent miscarriage, seeing a heartbeat at 10 weeks gave a 99.4 per cent chance of the pregnancy continuing — up from 98 per cent at 8 weeks and 78 per cent at 6 weeks.

One caveat almost never stated: those heartbeat figures come from a study of over 300 women with a history of recurrent miscarriage, so their baseline risk was higher than average. For most people the equivalent numbers would be at least as reassuring.

Tommy's estimates early miscarriage at 10 to 20 in every 100 pregnancies overall, with most happening in the first 12 weeks and risk falling dramatically after 12 weeks. At 10 weeks, most of that risk is behind you.

You will find week-by-week miscarriage percentage tables all over the internet. Tommy's, which funds the UK's national miscarriage research centre, says openly that beyond the well-evidenced drop after 12 weeks, reliable week-by-week risk research does not really exist. We give you what is evidenced instead.

Many people find weeks 10 and 11 harder emotionally than earlier weeks, precisely because the scan is close enough to think about. That anticipation is normal and does not mean anything is wrong.

The most common cause of early miscarriage is a chromosomal problem that happens by chance. Not lifting something, not a glass of wine before you knew, not stress or exercise. Tommy's states it directly: miscarriages very rarely happen because of something you did or did not do.

Is it safe to fly at 10 weeks pregnant?

Yes, in a straightforward pregnancy. The RCOG is unambiguous: occasional air travel is not harmful in an uncomplicated pregnancy. There is no evidence that cabin pressure or humidity harm you or the baby, and no evidence that flying causes miscarriage, early labour or your waters to break.

The most important consideration at 10 weeks is your dating scan. The NHS offers it at around 10 to 14 weeks, and if you have agreed to screening for Down's syndrome the combined test — which includes the nuchal translucency measurement — is normally done at the same appointment. That test has a hard window. If your scan falls after 14 weeks you are offered a different blood test between 14 and 20 weeks, which the NHS says is not quite as accurate. A trip that pushes your scan past 14 weeks is worth rescheduling.

The risk that is real: blood clots

Pregnancy raises deep vein thrombosis (DVT) risk from the earliest weeks. ACOG puts it plainly: any travel of four hours or more — car, train, bus or plane — doubles DVT risk, and pregnancy adds to that. Under four hours the RCOG says you are unlikely to need special measures. Over four hours:

• Loose clothing, comfortable shoes, an aisle seat, regular walks about the cabin
• In-seat exercises roughly every 30 minutes
• Water steadily; cut down on caffeine
• Graduated compression stockings — not ordinary flight socks, and sized for you by a midwife or doctor

With other clot risk factors you may be advised to have heparin injections around the flight.

Practical points

• No airline restricts travel this early — cut-offs sit around 36 to 37 weeks for one baby, 32 for twins.
• Check what maternity and emergency care exists at your destination.
• Tell your insurer you are pregnant; cover should include pregnancy-related care.
• Some travel vaccines and anti-malarial tablets are unsuitable in pregnancy; travel to Zika areas is not recommended.

ACOG names 14 to 28 weeks as the best time to travel. You are close to it.

When to call your midwife or doctor

Early pregnancy is full of sensations that turn out to be nothing. These are the ones worth a phone call.

Get emergency help now

Call your local emergency number (999 in the UK and Ireland, 911 in the US and Canada, 000 in Australia, 111 in New Zealand) or go to an emergency department if you have bleeding with any of the following, which the NHS lists as needing immediate assessment:

• Severe abdominal pain you cannot concentrate through
• Pain in the tip of your shoulder
• Feeling sick, faint or dizzy, or losing consciousness
• Heavy bleeding that soaks through a pad quickly

Sudden sharp abdominal pain with dizziness, faintness or looking very pale can indicate a ruptured ectopic pregnancy, needing same-day surgery. Around 1 in every 90 UK pregnancies is ectopic, and the NHS notes symptoms usually appear between weeks 4 and 12 — where you are now.

Call your midwife, early pregnancy unit or health line today

• Light bleeding or spotting, with mild or no pain
• One-sided pain low in your abdomen or pelvis
• Brown, watery discharge that is new for you
• Pain when you pee or open your bowels
• You cannot keep food or fluid down for 24 hours, your urine is very dark or absent for 8 hours, you feel severely weak or faint, or you are vomiting blood or losing weight — the NHS triggers for pregnancy-sickness help, which is treatable

You do not need a booking appointment first, and you do not need to be certain something is wrong.