Posted by Tricia on May 01, 19100 at 16:21:08:
I am 7weeks pregnant - taking estrace twice and progesterone
  4x daily, bbasp,prenatal- my estrace 2 weeks ago was
  548 this past Friday it is 732- my prog is also rising
  My sono is scheduled Friday -
  At what point and what basis do you make the decision
  that the embroyo is producing enough to sustain preg?