Duration of down regulation on Burselin/Suprefact Injection

[ifyodims]

Hi, I started long protocol IVF using burselin injections for down regulation on 8 March 2006. I was most disappointed to be told after 13 days (20 March) of being on the injection that my womb lining is still not thin. What is the longest time it has taken for any of you to achieve down regulation? Been told to come back on 25 March to check again. What if by then down regulation has still not been achieved? Does this mean my IVF cycle/treatment will be cancelled? Any help at all on the subject will be much appreciated as this is my first time.