I am supposed to be 19 weeks pregnant as of Saturday my last period was November 19th I had an ultra sound at 7 weeks and 2 days everything was fine and measuring correctly at 17 weeks they listened to my baby's heart beat with the doppler and it was 147. 3 days a go I went to the docter for an ultra sound they could not find a heart beat and said the baby was only measuring 9 weeks so where did the 147 come from? Could it be twins and they just haven't seen the other baby? The docter had no explanation for how the nurse got a heart beat because he said a baby at 9 weeks cannot even pick up on the doppler.