The mother's first perception of fetal movement; a symptom rather than an independent examiner's demonstration.
Rebound felt after displacement of a mobile object in fluid. In a suitable obstetric setting it is a probable sign of pregnancy, not by itself proof of a living fetus.
A pregnancy implanted outside the normal endometrial cavity; tubal rupture can cause severe internal haemorrhage.
A dating measure conventionally reckoned from the first day of the last menstruation, rather than directly from observed fertilization.
