Assertion: miscarriage's pregnancy | /r/HasProperty | mistaken for missed miscarriages
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text: In early pregnancy, the embryo grows larger every day and being off even by a few days with the dating can make a difference in the measurements and in whether or not first-trimester ultrasound will detect a fetal heartbeat.﻿﻿ Women who have irregular menstrual cycles or who were uncertain about their dates may have normal pregnancies that could initially be mistaken for missed miscarriages when the ultrasound does not show the expected development counting from the last menstrual period.