Week 5 of Pregnancy
First trimester
For informational purposes only. This page is not medical advice. Every pregnancy is different — always consult your doctor, midwife, or healthcare provider for guidance specific to your situation. In an emergency, call your provider or 911 immediately.
Baby is
about the size of a sesame seed
0.13 inches · less than 1 oz
Baby this week
- •Heart is beginning to beat and circulate blood
- •Neural tube is developing into the brain and spinal cord
- •Three layers of cells are forming (will become organs and tissues)
- •Amniotic sac and yolk sac are visible on ultrasound
You this week
- •Missed period (primary sign you're pregnant)
- •Breast tenderness and swelling
- •Fatigue and increased need for sleep
- •Nausea (may or may not appear yet)
- •Increased urination
- •Mild cramping or pelvic pressure
- •Mood changes and heightened emotions
This week's tips
- •Schedule your first prenatal appointment if you haven't already—it's often the most detailed visit
- •Start taking prenatal vitamins with folic acid if you haven't (400-800 mcg daily helps prevent neural tube defects)
- •Be gentle with yourself about fatigue; your body is working hard even though you can't see it yet
- •Keep a symptom journal to share with your doctor at your first visit
- •Limit caffeine to under 200 mg per day (about one cup of coffee)
Informational only — always check with your doctor or midwife for advice specific to you and your baby.
Looking ahead
By week 6, you may have your first ultrasound where you'll see the gestational sac and possibly hear a heartbeat—an incredibly emotional milestone for many parents. Your hormone levels will continue rising, which may intensify early pregnancy symptoms.
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For informational purposes only. This page is not medical advice. Every pregnancy is different — always consult your doctor, midwife, or healthcare provider for guidance specific to your situation. In an emergency, call your provider or 911 immediately.
This content is for informational purposes only and is not medical advice. Every pregnancy and baby is different. Always consult your doctor, midwife, or pediatrician for guidance specific to your situation.
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