A–Z Glossary

Zygote

A zygote is the single cell formed when an egg is fertilized, before it develops into a multicellular embryo.

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Month 1 of pregnancy: symptoms, embryo development, and what to expect

Month 1 of pregnancy: symptoms, embryo development, and what to expect

How month 1 is counted Pregnancy is usually measured by gestational age, which starts on the first day of the last menstrual period. This convention is useful because the exact day of fertilization is often unknown. In a typical 28-day menstrual cycle, ovulation and conception occur around week 2 of gestational age, although cycle length […]