Morning sickness
Why nausea and vomiting happen in pregnancy, when they ease, what helps and when to call a doctor.
3 min read
First trimester
Week 1 of pregnancy
Pregnancy is counted from the first day of your last period, so in week 1 there is no baby yet. Your body is getting ready.
Your baby this week
- There is no baby yet: week 1 is the week of your period.
- Doctors count the 40 weeks from the first day of your last period, because the day of conception is rarely known exactly.
- In your ovaries a few eggs have started to ripen; usually only one will be released.
Your body this week
- Your womb is shedding last month’s lining and starting to build a new one.
- You may have your usual period symptoms: cramps, tiredness or mood changes.
- If you are planning a pregnancy, folic acid (400 micrograms a day) helps the baby’s brain and spine develop from the very first weeks.
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Read more for this stage
Your first pregnancy appointments
When to see a doctor once you know you are pregnant, what happens at the first appointment and what the check-ups look like until the birth.
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Early signs of pregnancy
A missed period, tiredness, sore breasts and nausea: how to recognise the early signs, when to take a test and when to see a doctor.
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General information written by the mam.al editors. Every pregnancy is different and sizes are averages; it does not replace advice from your doctor or midwife. Sources include the NHS week-by-week guide to pregnancy. NHS. Contains public sector information licensed under the Open Government Licence v3.0.