A sample size of 40 patients will provide 13% accuracy for pregnancy rate. Recruitment will end after 40 patients have completed the protocol up to the stage of embryo transfer. Up to 75 women will be recruited in order to assure that 40 patients complete the protocol. The primary endpoint is the biochemical pregnancy rate. Secondary endpoints include implantation rate and clinical pregnancy rate. For the purposes of comparison a cohort of patients not in the study undergoing the traditional hormone replacement preparation will be analyzed.