Sooo scared please help!

Tanya
Dose anyone know how long after a yolk sac is seen should they see a fetal pole?? Had an ultrasound last wed which finally just showed a yolk sac was scheduled for another ultrasound today where they said they should see a fetal pole and didn't but I m not ready to terminate so asked to wait another week. I'm scared and beyond heart break as this is my rainbow baby that I want more then anything in this world.