I wanted to share my success story as I was desperate to find something like this at the time and wanted to give someone else some hope... We did a 5dt in January. Hcg numbers were as follows:

10dp5dt 279

12dp 369

14dp 490

16dp 956

My hcg was not doubling and doctors thought it was an ectopic non viable pregnancy. I insisted on staying on my meds and now have a healthy little boy from this transfer. Good luck all of you tough worriers out there. I hope this gives someone much needed hope.