A–Z Glossary

Blastocyst

A blastocyst is an early cluster of cells that contains cells destined to form the embryo and placenta.

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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 […]