Inclusion Criteria:  Couples starting IUI with Mild Ovarian HyperStimulation (MOH), with the intend to receive this treatment for at least six months. Diagnosis of unexplained (primary or secondary) infertility Hunault <30% (or >30%, after an expectant management period of at least 6 additional months). Females aged >18 years with regular menstrual cycle. Total mobile sperm count (VCM) >10 million.  Exclusion cirteria:  Cycle irregularities Male factor infertility