IRCT20160308026962N5 IRCT 2021-12-23 Oroumia University of Medical Sciences Effect of progesterone and aspirin on refusing uterine artery resistance and pregnancy outcome Comparison of progesterone and two different doses of aspirin effect on refusing uterine artery resistance and pregnancy outcome 2022-01-05 anticipated 200 Complete https://irct.ir/trial/60728 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: This study will be performed using permuted randomization using shuffling cards. In this study, 200 cards with equal ratios (50 cards for each group) will be selected. After merging the cards, a card will be taken out and its allocation will be recorded. After re-merging the cards, another card will be removed. This process continued until a random sequence according to the sample size will be reached. 2-3 Effect of Progesterone and Aspirin on reducing uterine artery resistance and pregnancy outcome. Intervention 1: Intervention group 1: Progesterone suppository recipient once a day for two weeks. Intervention 2: Intervention group 2: 80 mg Aspirin recipient once a day for two weeks. Intervention 3: Intervention group 3: 160 mg Aspirin recipient once a day for two weeks. Intervention 4: Control group: Patients did not receive any drugs. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no more information.