This is a rare member abnormality. If separation grows larger it could lead to miscarriage. You are advised to rest. Between 14th and 16th week of pregnancy amnion and chorion fuse together. Before 14th week is normal that amnion and chorion be separated. If after 16th week there is still no fusion between amnion and chorion, this can be associated with preterm delivery or even some chromosomal abnormalities. Down syndrome is one of chromosomal abnormalities. Have another appointment and talk with your doctor, or maybe ask for second opinion.
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