Endometrial Scratching by Pipelle on Pregnancy Rate in Unexplained Infertility

Research question: Population: women with unexplained infertility. Intervention: endometrial scratching by pipelle for women with unexplained infertility. Comparison: to compare with non endometrial scratching for women with unexplained infertility. Outcome: the biochemical pregnancy rate. Research hypothesis: Null hypothesis: there is no difference in the rate of pregnancy between scratching and non endometrial scratching in women with unexplained infertility. Alternative hypothesis: there is difference in the rate of pregnancy between scratching and non endometrial scratching in women with unexplained infertility.