First u/s

Went to our first ultrasound last week. I was glad that our baby was where it was supposed to be and I guess kind of.in shock. Lol So didn't really say anything. Tech showed us legs and feet and then got some good pics and said heart rate was 165 and good for this stage but then asked if I was sure of my lmp. Which I was like yea but didn't ask anything now I'm regretting it. Makes me wonder if we're measuring off.? Next appt with Dr not until Feb. 3rd. Anyone else freeze? And not ask questions?