First trimester · Month 1 of 9

Week 4: A missed period and the first test

A missed period or positive test may be the first clue; mild cramps or spotting can occur, but pain or heavier bleeding needs advice.

Month 1 · Week 436 weeks to the due-date marker
Month1 of 9
Week4
PeriodFirst trimester
This monthFinding out

In 60 seconds

Your short plan for this week

Do now

After a positive test, contact the maternity-care route for your area and save its urgent phone number.

Coming up

Ask when your first visit is usually booked and what information to prepare, such as the first day of your last period and current medicines.

Pause and ask

A home test confirms pregnancy hormone, not where the pregnancy is or whether it is developing normally.

What you may notice

Your body and how you may feel

A missed period or positive test may be the first clue; mild cramps or spotting can occur, but pain or heavier bleeding needs advice.

What is happening

Baby’s development this week

A tiny group of rapidly dividing cells is establishing the structures that will support pregnancy.

Plain-language examples

What this means in real life

Mild period-like cramping can happen. Pain that is severe, one-sided, worsening, or paired with dizziness or shoulder-tip pain needs urgent assessment.

A short checklist

What to do now

  • After a positive test, contact the maternity-care route for your area and save its urgent phone number.
  • Review medicines and supplements with a clinician or pharmacist.
  • Choose food-safety and substance-free habits without chasing perfection.

Pause and check

What not to do—or what to ask first

  • A home test confirms pregnancy hormone, not where the pregnancy is or whether it is developing normally.
Check food, medicines, exercise and everyday activities →

What may be coming up

Appointments, tests and decisions

Ask when your first visit is usually booked and what information to prepare, such as the first day of your last period and current medicines.

For the support person

One useful thing a partner can do

  • Listen to the reaction before planning. Excitement, fear and uncertainty can appear together.

Contact your care team

Contact your doctor or maternity team promptly

Some concerns need advice before the next routine appointment even when they do not feel like an emergency. If a symptom becomes severe, sudden or frightening, use urgent care instead.

See when to contact care

Urgent or emergency

Urgent signs during pregnancy or within a year after birth

Get medical care immediately for these symptoms. The list is not exhaustive; if something feels seriously wrong, seek help.

Open urgent warning signs