8 week Ultrasound

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Friday is my first ultrasound in which it will be trans vaginal. To determine that my due date is correct I’ll be 8 weeks and two days that day.Im a little worried because according to my paper work I don’t get to hear the heart beat until I’m 12weeks! 😏I’m really bummed out because I really wanted to hear the heart beat considering I miscarried in the past and never got an ultrasound or to experience any of that!