Table of ContentsView AllTable of ContentsEmbryoFetusEmbryonic StageFetal StageRisksPrenatal AppointmentFrequently Asked Questions
Table of ContentsView All
View All
Table of Contents
Embryo
Fetus
Embryonic Stage
Fetal Stage
Risks
Prenatal Appointment
Frequently Asked Questions
Vladimir Zotov / Getty Images
What Is an Embryo?
Week-to-Week Pregnancy Timeline
What Is a Fetus?
During the embryonic stage, important systems and organs begin to form. Cells multiply to create these systems.
Major Milestones During the Embryonic Stage
Major Milestones During the Fetal Stage
Embryo vs. Fetus: Which Stage Is More High-Risk?
What to Expect at Your First Prenatal Appointment
You should schedule the first prenatal appointment as soon as youlearn that you are pregnant. During the first prenatal appointment, you will discuss your:
Your healthcare provider may do the following:
Summary
A Word From Verywell
Thezygoteis the development stage before the embryo forms. A zygote is the fertilized egg.
In general, pregnancy is divided into three trimesters. The first trimester lasts from week one through week 12. The second trimester is week 13 through week 28. The third trimester is week 29 through 40.
3 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read oureditorial processto learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
Department of Health and Human Services Office on Women’s Health.Stages of pregnancy.
MedlinePlus.Fetal development.
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