 - Exclusion criteria are the presence of tubal factor infertility, grade III-IV endometriosis, more than 3 previous failed dIUI cycles, or patients in whom 3 follicles 14mm are observed during the IUI cycle. Patients will be included in the study only once. The randomization will be performed on the IUI cycle level. The group allocation will take place the day the dIUI and the biologist will randomized all included patients into one of the two groups using an open computer-generated list. 