They are saying this is a 13 week baby?

So last period was end of august. Had sex beginning of September. Told miscarriage happened at end of September. This ultrasound is supposedly 13 weeks today. Seems like everytime she goes they push this pregnancy back with how far along it is.

She just turned 17 btw. My sons aunt.

Anyone have any thoughts on this? Maybe ultrasound can help you all out?

And another thing they say she is too young to find out gender on ultrasound. They have to do blood test?

T.I.A.