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At 3 weeks, your baby is a ball of cells implanting in your uterus. See BabyCenter's week-by-week guide to pregnancy.
3 Weeks Pregnant: Spotting the First Signs of Pregnancy - HealthyWomen
3 Weeks Pregnant - American Pregnancy Association
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3 Weeks Pregnant: What to Expect, Pregnancy Week By Week
Trimester timeline: calculating pregnancy weeks to months - The Mother Baby Center