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Though follicle growth is little slow as it is 16th day of your cycle but with continuation of gonal-f follicle size will improve and reach its maturity. Estradiol
level is quite good and it suggests that many follicles are growing. Endometrial thickness is also good and it ll improve further. Once follicles reach maturity( 18mm) HCG injection
will given for egg rupture. In an IVF cycle success is around 30-40% ,which also depends on other factors ( eg age). Trust your doctor and hope for the best.