Definitions

• Gestational age refers to the duration of pregnancy dated from the first day of the last menstrual period (LMP), which precedes ovulation and fertilization by around 2 weeks.
  
• From fertilization to 10 weeks’ gestation (8 weeks post-conception), the conceptus is called an embryo. From 10 weeks to birth, it is a fetus.

Follicular development and ovulation

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