Luteal Support and Intrauterine Insemination (IUI) With Clomiphene Citrate

Inclusion Criteria: * Age ≤ 36 years * Body mass index between 18 and 29 * Presence of both ovaries * Basal levels of estradiol (≤ 80 pg/ml) and progesterone (≤ 1.6ng/ml) on day one of the cycle and a day three FSH level of \<12IU/L * Patients can enter the study only once. * Only the first IUI attempt will be included ( at the 2nd and 3 rd attempt progesterone could be administrated if it is necessary but these attempts will be excluded from the study) * Normal HSG (maximum 3 months prior starting the stimulation). * Donor sperm can be included Exclusion Criteria: * Polycystic ovarian syndrome (Rotterdam criteria) * Endometriosis(≥AFS III)