Calin- Not sure how your cycle is working. I was on a long down reg as well. I had a scan the day I started the pill to check there were no problems in the ovaries. Then my next scan was 21 days later, that was the down reg scan to check that everything was quiet and that there were no signs of ovulation. On the day I had my down reg scan I started the GonalF.

If you call the nurse you have an app with she should be able to tell you what your scan is for. It sounds like it would be to check that there are no issues with ovaries like cysts before you start on synarel or lucrin. If that is the case then one day should not make a difference, but to be on the safe side I would try to get in a bit earlier.
I hope that wasn?t too confusing?.