Nervous

Okay so I had an ultrasound today and the tech told me the baby was too small to tell me my due date and now im nervous because all she said is my doctor will be in touch and that she may have to perform it again. But based on my LMP im supposed to be 8 weeks 2 days so idk what the problem is or could be can someone , anyone give me some advice because im freaking out right now and I dont wanna stress and put more pressure on the baby . So tell me what you guys think ?