Pls help

Ms

So i have pcos... this is my 2nd pregnancy; my first ended in miscarriage. I had my doctors appt and he gave me lab work for HCG i am extremely anxious because as he said if the numbers are not doubling the pregnancy is not viable and im paranoid about going thru another miscarriage. My questions is... has anyone had a 2nd pregnancy successful and brought the rainbow baby home?