One arm will be treated by luteal Decapeptyl on days 3, 6,9 post ovulation triggering. Second arm will be treated by low dose hCG on day 3 post triggering. All patients to be recruited are treated for acceptable IVF indications in Meir medical center (MMC) and their registry is computerized in the general system of MMC. For the purpose of the study we will use the only the data of patients recruited to the study and were giving their informed consent. Each patient recruited will have a unique study identity (ID) . The patients' information will be pooled from the computerized file into an Excel spread sheet: in this Excel file the names will be erased and only the unique study ID will appear. The information regarding the coding key will be kept as a hard copy in a locked room inside the IVF unit in a special study folder. The study was approved by MMC institutional Helsinki board.