First Appointment

Tanja • My husband & I are so excited for our sixth child. Our kids are 16,15,12, 4(the boys) daughter is 5!
So my first appointment was today. Everything looks great. Baby heart rate is 170bpm. Doctor is keeping my due date as 9/16/16 even though baby was measuring at 9wks3days. :-) 
I've never heard of the ramzi theory but what the heck...what do you ladies think? This is transvaginal.