Hypo umbilical cord, prominent gallbladder

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Had my 21 week ultrasound today. Heart beat 171. Everything.looked good besides hypo umbilical cord, which means the cord is straight in some places and prominent gallbladder. Dr has no idea what these mean for my baby and referred me to maternal fetal specialist. Whom im trying to get in to see immediately. Has anybody had this during.pregnancy? Im so scared ..im crying.