I HAVE BEEN TOLD I WILL BE ON PUREGON INSTEAD OF GONAL F DOES ANYBODY KNOW IF THERE IS A DIFFRENCE BETWEEN THE TWO? IF THERE ARE ANY ADVANTAGES OR DISADVANTAGES?

hi am just new to this site so sorry if im repeating anything which has already been discussed. i have endometreosis & 3 failed ivf attempts & was wondering how long you need to leave inbetween treatment cycles?
is there any inparticular time scale ie 1 month 6 months ect?