Using ultrasound just a few days after the expected menstrual period a gestational sac with a diameter of 2-3 mm can be detected within the uterine endometrium. Developmental changes in the structure and organization of the placenta and membranes can be seen by ultrasound . Minor anatomical variations, such as cysts and lakes, can readily be distinguished from lesions that destroy functioning villous tissue, such as infarcts and intervillous thrombi. Small placentas typically have eccentric cords, due to chorionic regression, and can have progressive parenchymal lesions - these features are typical in early-onset IUGR . Placental location and cord insertion are relevant to document. Pathological placental invasion (placenta acreta or percreta) may be suspected by ultrasound, and can be confirmed by magnetic resonance imaging (MRI).
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.