23# Yui
Hmm..that's weird cause I've been to a maternity clinic and also had 2 different specialists and it's the same procedure (Doppler to detect heartbeat in office, ultrasound at 18-20th week) for both my pregnancies BUT...if your doctor is worried about your health and/or you have an underlying health issue, they might require to do an ultrasound beforehand. But even so...at weeks 7 it's very hard to detect the fetus by ultrasound, unless they do a vaginal ultrasound.
But like you said, every doctor is different. Maybe your doctor was worried about you and that's why she ordered so many tests...
Also they usually do a lot of blood tests in the early weeks to detect if you have any problems or chemical imbalance (not enough iron..etc...). Then if they need to, they will do the chromosome test and also amniocentesis...
anyways, hope all moms have a healthy bb! 
And for lizzie : I meant Doppler. |