1 Weeks Pregnant
Week 1 is counted from the first day of your last period, so it happens before there is an embryo. It still matters: your body is preparing the conditions a pregnancy needs.
- Size of
- nothing yet — conception has not happened
- Length
- —
- Weight
- —
- Trimester
- 1
Your baby this week
- There is no baby yet — your body is shedding the old lining and starting a fresh cycle.
Your body this week
- Your period marks day one, and pregnancy weeks are counted from here.
- The uterine lining sheds and a new one starts to build.
Common symptoms
- Ordinary period symptoms — cramps and a heavy, tired feeling
- Deep tiredness, even after a full night of sleep
- Mood that swings quickly, driven by hormones
What to expect
Early pregnancy can feel invisible from the outside and very loud on the inside. Symptoms come and go from day to day, and that is normal. With 39 weeks to go, the priority this week is rest, gentle food and your first antenatal appointment.
Tips for this week
- Take 400 µg of folic acid daily — it protects the neural tube before you know you are pregnant.
- Track your cycle so you know your fertile days and your dating is accurate later.
- Stop alcohol and smoking, and check any medication with your doctor.
Frequently asked questions
How many months is 1 weeks pregnant?
1 weeks is about 0 months. Pregnancy months do not divide evenly into weeks, so counting in weeks is more precise.
How big is my baby at 1 weeks?
At 1 weeks your baby is around nothing yet — conception has not happened — roughly — long and about —. Healthy babies vary a lot around these averages.
What symptoms are normal at 1 weeks pregnant?
The most common ones this week are listed above. Contact your doctor or midwife about heavy bleeding, severe pain, a fever, or any change in your baby’s movements.
Pregnancy weeks are counted from the first day of your last period, so week 1 begins before conception.
This article is for general information only and is not medical advice. Always talk to your doctor or midwife about your own pregnancy.