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First trimester pregnancy

Definition:
First trimester pregnancy is the early stage of pregnancy from conception to 12 weeks gestation, or about 14 weeks from the first day of the last normal menstrual period (LNMP).

Alternative Names:
Early pregnancy; Pregnant - first trimester

Causes, incidence, and risk factors:

Pregnancy is a normal condition and, in most situations, should not be approached as a problem or disease.

A pregnancy begins with conception, when a sperm from a fertile male joins with an ovum (egg) of a fertile female. Any fertile female engaged in a sexual relationship with a fertile male is at risk of becoming pregnant.



Review Date: 1/27/2002
Reviewed By: Dominic Marchiano, M.D., Department of Obstetrics & Gynecology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.

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