Week 6 of Pregnancy

Length

0.5 cm

Crown-rump (CRL)

Weight

Not yet measurable

Fetal development

• The heart beats at roughly 100–150 bpm and may be detected on transvaginal ultrasound.
• Tiny arm and leg buds appear and facial structures begin to form.
• The embryo is about 5mm long.

Maternal changes

• Morning sickness, fatigue, and breast tenderness often peak this week.
• Smells may suddenly become intense; food preferences can swing wildly.

Recommended checkups

• The first prenatal ultrasound often confirms the gestational sac and heartbeat around now.

Related calculators

• Due date Calculate pregnancy week and due date from your last period
• βhCG doubling time Calculate hCG doubling time and daily rise from two early pregnancy blood tests
• Pregnancy weight gain Track cumulative gain against the IOM recommended range by pre-pregnancy BMI

Related topics

• Implantation Bleeding Light early-pregnancy spotting — timing, color, vs. a period
• Early Pregnancy Symptoms The 13 most common signs in the first 1–4 weeks
• Morning Sickness The most common symptom of weeks 6–12 — timing, severity, and relief

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