Effect of acupuncture on endometrial receptivity in women with thin endometrium: a randomized controlled study

INTERVENTION: Control:Shallow needling on control points;Acupuncture :Acupuncture; CONDITION: Thin endometrium PRIMARY OUTCOME: Endometrial Thickness; SECONDARY OUTCOME: Clinical pregnancy rate;Serum estradiol levels;uterine arterial blood flow;Endometrail blood flow;Self‐Rating Anxiety Scale, SAS;Endometrial classification; INCLUSION CRITERIA: 1.Women aged 20‐40 with fertility requirements; 2.More than once with endometrium <7mm on the day of hCG administration after ovarian stimulation or on the day of progesterone administration; 3.Volunteer to participate in the trial and sign an informed consent form.