A–Z Glossary

Gestational sac

A gestational sac is an early pregnancy structure that helps support development before the embryo is clearly visible.

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Early pregnancy diagnostic approach

Early pregnancy diagnostic approach

Why early pregnancy diagnosis is stepwise Early pregnancy can be difficult to diagnose because normal symptoms overlap with premenstrual changes, gastrointestinal illness, stress, and irregular cycles. Even in a medically supervised setting, the first evaluation rarely answers everything at once. A stepwise approach reduces the risk of missing an ectopic pregnancy or misclassifying a very […]

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 […]