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Week 4

First Trimester · 36 weeks to go

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Week 4 details

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Symptoms, appointments, notes

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Track pregnancy to-dos

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Weekly to-dos at a glance

Around Week 4

Week 2

Ovulation typically occurs this week — your fertile window

Week 3

Fertilization occurs — sperm meets egg in fallopian tube

Week 4

Blastocyst implants in uterine lining — pregnancy established

Week 5

Missed period — pregnancy test positive

Week 6

Heart beating — often visible on ultrasound