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First, determine the first day of your last menstrual period. Next, count back 3 calendar months and add 1 year and 7 days to that date.

Labor usually starts 2 weeks before or after the estimated date of delivery. No one knows exactly what sets off the onset of labor. Read on to learn more.

The tissue that lines the uterus is called the endometrium. Normally, if a woman doesn’t get pregnant, this tissue is shed each month during her period. In endometriosis, tissue that looks and acts like endometrial tissue implants outside the uterus.This can cause pain, heavy periods, and infertility.

Read on for detailed information on dental sealants, and why they are so effective.

Learn about prenatal medical care, including why it's important, who provides it, and what happens during visits.

Tubal ligation is a permanent form of birth control in which a woman's fallopian tubes are tied or blocked. This keeps the egg and sperm from connecting and so prevents pregnancy.

Evoked potentials studies measure electrical activity in the brain in response to stimulation of sight, sound, or touch.

A sinus X-ray is an imaging test that uses X-rays to look at your sinuses. The sinuses are air-filled pockets (cavities) near your nasal passage.

Amniocentesis is a procedure used to take out a small sample of the amniotic fluid for testing.