IRCT20180624040214N1 IRCT 2018-11-21 Tehran University of Medical Sciences Endometrial scratch on the incidence of pregnancy in intrauterine insemination The Effect of endometrial scratch on pregnancy rate in intra uterine insemination cycle(IUI). 2018-10-12 anticipated 120 Complete https://irct.ir/trial/32114 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The randomization method is using random blocks of size 4.Based on random blocks with the size 4, the first sample A-second A-third B-fourth B and so on continued until 120 samples were completed. A random sequence is performed using a number of sealed non-transparent envelopes, which randomly stores the random sequences onto the card, The cards in the envelope are placed in sequence respectively. The clinician examines patients in terms of entry and exit criteria, and the clinic's midwife allocates participants to the study groups randomly by randomization method. N/A Infertility. Intervention 1: Intervention group: Stimulation of ovulation with Letrozole will be done the 3-7 day when the diameters of 1-2 follicles reached more than 18 millimeters, HCG is injected and after 36-38 hours, IUI will be done. In the intervention group , in addition to the routine method, On the 3rd cycle, by using Karman cannula 4, an endometrial scrub performed. Patients undergo lithotomy and without anesthesia, an endometrial scratch on the posterior wall of the endometrium is injected by an infertility specialist. Intervention 2: Control group: Stimulation of ovulation with Letrozole will be done the 3-7 day when the diameters of 1-2 follicles reached more than 18 millimeters, HCG is injected and 36-38 hours after IUI will be done, But endometrial scratch is not performed in this group. No - There is not a plan to make this available Justification or reason for not sharing IPD is keep up the secrets of the patients.