Most of it is normal. A short list of things is not.
What the first trimester actually feels like week by week, and the specific symptoms that mean you ring your midwife today rather than waiting for your next appointment.
Quick answer
Nausea, exhaustion, sore breasts, food aversions, a metallic taste, mild cramping and needing to wee constantly are all common in the first trimester and usually start between weeks 4 and 6. ACOG reports that nausea and vomiting affect roughly 70 to 80 percent of pregnancies, and for most people symptoms ease between weeks 12 and 14. Call your midwife, GP or maternity unit the same day if you have vaginal bleeding, severe or one-sided abdominal pain, pain at the tip of your shoulder, cannot keep fluids down for more than 24 hours, have a fever, or notice pain when weeing.
The first trimester is the part of pregnancy with the biggest gap between how you feel and what anyone can see. There is no bump to explain it. You may not have told work. And the symptoms arrive in a jumble, so it is genuinely hard to know which ones are ordinary and which deserve a phone call.
This is a week-by-week map of what is common, written to sit alongside our first trimester checklist for weeks 1 to 13, which covers the appointments and admin rather than the symptoms. Nothing here replaces your midwife. It is here so that when something feels off, you already know whether it belongs on the normal list.
Of pregnancies involve nausea, vomiting or both (ACOG)
Of pregnancies involve hyperemesis gravidarum, the severe form that needs treatment (ACOG)
When first trimester nausea eases for most people (ACOG)
Weeks 4 to 5: the first signals
A missed period is usually the headline, but plenty of people notice something before the test. Sore, heavier, unusually sensitive breasts are one of the earliest changes. Mild cramping and light spotting can happen around the time the embryo implants, and the NHS notes that light spotting in early pregnancy is common and often harmless. That said, any bleeding is worth a call, because early pregnancy assessment units exist precisely to check it quickly.
Tiredness at this stage is not ordinary tiredness. It is the kind that arrives at 3pm and makes a conversation feel like heavy lifting. Rising progesterone is the usual explanation.
Weeks 6 to 7: the peak of the nausea for many
The name morning sickness is one of medicine's worst pieces of branding. It is frequently all day, and often worse when your stomach is empty, which is why it can be at its most brutal on waking and again in the evening.
Alongside it: aversions to foods you previously liked, a metallic taste, a sense of smell that has become an unwelcome superpower, and constant trips to the toilet as blood volume and kidney filtration rise. Constipation is also common, largely because progesterone slows the gut.
What tends to help, none of it dramatic: small frequent snacks rather than meals, something plain to eat before you get out of bed, cold food over hot because it smells less, and staying on top of fluids in small sips. If it is stopping you working, eating or drinking, that is the point to ask for help rather than endure it. Effective anti-sickness treatments exist and are prescribed in pregnancy.
Weeks 8 to 9: symptoms settle into a pattern
By now most people know their own version of the first trimester. Nausea, exhaustion and breast tenderness are usually still present. Mood swings are common and are not a character flaw, and headaches and dizziness turn up for some people as blood pressure shifts.
Your booking appointment usually lands in this window, which makes it the natural place to raise anything that is worrying you. Write the questions down beforehand, because they evaporate the moment someone takes your blood pressure.
Weeks 10 to 11: the fog
Sleep often becomes strange even before there is a bump to blame. Vivid dreams, waking at 4am, and needing the toilet twice a night are all reported commonly. Some people notice their gums bleed when brushing, which is a recognised effect of pregnancy hormones on gum tissue and one reason NHS dental care is free during pregnancy in the UK.
Skin does whatever it wants. Some people glow. Plenty break out. Neither predicts anything.
Weeks 12 to 13: the corner, for most people
This is when many people feel the shift. ACOG notes that nausea typically improves between weeks 12 and 14, and energy often follows a week or two later. It is not universal. Some people carry sickness well into the second trimester, and a small number carry it the whole way. That is not a sign you are doing anything wrong.
The dating scan usually sits in this window too, which is why it is the point at which many people start telling people. Our week 14 to 27 checklist picks up from here.
Common symptoms at a glance
| Symptom | Typically starts | What is going on | When to raise it |
|---|---|---|---|
| Sore, heavy breasts | Weeks 4 to 6 | Hormonal changes and increased blood flow | Only if there is a lump, redness or heat |
| Nausea and vomiting | Weeks 5 to 6 | Affects 70 to 80 percent of pregnancies (ACOG) | If you cannot keep fluids down for 24 hours, or are losing weight |
| Extreme tiredness | Weeks 4 to 6 | Rising progesterone, increased blood volume | If accompanied by breathlessness or palpitations, ask about anaemia |
| Needing to wee constantly | Weeks 6 to 8 | Increased kidney filtration | Immediately if it stings, smells strong or you have a fever |
| Mild cramping | Weeks 4 to 12 | The uterus growing and ligaments stretching | If it is severe, one-sided, or comes with bleeding |
| Light spotting | Weeks 4 to 6 | Common in early pregnancy and often harmless (NHS) | Any bleeding is worth a same-day call to be checked |
| Constipation and bloating | Weeks 6 onwards | Progesterone slowing the digestive tract | If there is bleeding, or nothing shifts with fluids and fibre |
| Headaches and dizziness | Weeks 6 to 12 | Blood pressure and blood volume changes | If severe, persistent, or with visual disturbance |
Ring your midwife, GP or maternity unit the same day if
You have any vaginal bleeding. You have severe abdominal pain, especially on one side. You have pain at the tip of your shoulder. You cannot keep any fluids down for more than 24 hours, or you are passing very little urine. You have a temperature over 38C. It hurts or stings to wee. You feel faint or your heart is racing. You have a severe headache with vision changes.
Shoulder-tip pain with abdominal pain and bleeding is specifically associated with ectopic pregnancy and is treated as an emergency by the NHS. If you cannot reach your midwife, go to your nearest early pregnancy unit or emergency department. Nobody will think you overreacted.
The symptoms nobody warns you about
A few that are genuinely common but rarely make the standard lists. Excess saliva, which has a proper name, ptyalism, and mostly affects people with significant nausea. A stuffy, congested nose that has nothing to do with a cold, caused by swelling in the nasal lining. Bleeding gums. A heightened sense of smell that turns the office kitchen into a hazard. Vivid, occasionally alarming dreams. And an emotional volatility that can feel out of proportion to anything actually happening.
Feeling low or anxious in early pregnancy is also common, and it is a clinical issue rather than something to push through. Your booking appointment includes questions about mental health for exactly this reason. Answer them honestly.
Why tracking helps more than remembering
Symptoms in the first trimester blur together, and appointments are short. The mums who get the most out of a 15 minute midwife appointment are almost always the ones who wrote things down: when the nausea started, how many days you have struggled to eat, what your resting heart rate feels like, which questions you had at 2am.
It does not need to be elaborate. A notes app works. So does a page in a notebook. What matters is that it is one place, and that you can hand it over. We compared the two approaches honestly in pregnancy planner versus pregnancy app, and the answer is mostly whichever one you will actually keep open.
One place for the whole journey
If you prefer paper, our Bump to Baby Complete Planner Bundle is a 141 page printable set covering pregnancy tracking, appointment and question logs, a birth plan template, hospital bag checklist and newborn trackers. It is a one-time $35 download with no subscription, and you print only the pages you want. Use code GLOW20 for 20 percent off.
Frequently asked questions
Is it bad if I have no first trimester symptoms at all?
No. Symptom intensity varies enormously and having few or none is within the normal range. ACOG reports that 70 to 80 percent of pregnancies involve nausea or vomiting, which means a meaningful share do not. Symptoms are not a measure of how the pregnancy is going. If you are worried, your midwife would far rather reassure you than have you sit with it.
My symptoms disappeared overnight. Should I be concerned?
Symptoms often fluctuate, and a good day is usually just a good day. Around weeks 12 to 14 a fade is expected. A sudden and complete loss of symptoms much earlier than that, particularly alongside bleeding or cramping, is worth a same-day call to your midwife or early pregnancy unit for peace of mind and a check.
How much vomiting is too much?
The threshold most services use is being unable to keep fluids down for 24 hours, weight loss, or passing very little dark urine. That pattern can indicate hyperemesis gravidarum, which ACOG says affects up to 3 percent of pregnancies and is treated rather than endured. Contact your GP or maternity unit rather than waiting for your next appointment.
Can I exercise while I feel this rough?
Movement is generally encouraged in an uncomplicated pregnancy, and ACOG recommends regular moderate activity, but the first trimester is not the moment to start anything ambitious. Walking and gentle pelvic floor work are the usual starting points. Clear it with your midwife if you have bleeding, pain, or any pregnancy complication.
When do first trimester symptoms usually stop?
For most people nausea eases between weeks 12 and 14, with energy returning slightly later, though tiredness can linger. A minority have symptoms into the second trimester or beyond. Our trimester by trimester overview sets out what typically changes next.
Sources: American College of Obstetricians and Gynecologists (ACOG), Morning Sickness: Nausea and Vomiting of Pregnancy, and Exercise During Pregnancy guidance; NHS, Signs and symptoms of pregnancy, Vaginal bleeding in pregnancy, and Ectopic pregnancy; NHS, Your pregnancy and baby guide, weeks 4 to 13.
This article is general education, not medical advice, and Mumma Glow is not affiliated with the NHS or ACOG. Symptoms and experiences vary from mum to mum, and this guide cannot tell you what is happening in your own pregnancy. Always contact your GP, midwife, obstetrician or local maternity unit about symptoms that worry you, and seek emergency care for bleeding, severe pain or shoulder-tip pain.