Study on the Effect of Combined Estrogen and Progestogen Therapy on Endometrial Repair After Induced Abortion

Inclusion Criteria: * Age between 18 years old (inclusive) and 40 years old (inclusive) * Body Mass Index (BMI) ranging from 18.5Kg/㎡ to 23.9Kg/㎡ * Experienced at least 2 abortions or had a missed abortion * Confirmed gestational age of no more than 10 weeks, and the ultrasonic examination within three days prior to the surgery shows a gestational sac (average of three diameters) of at least 1.0cm, with an embryo length of no more than 3.0cm * Normal preoperative examination results as per the "Clinical Diagnosis and Treatment Guidelines and Technical Operation Standards: Family Planning Volume (2017 Revision)" * Capable of regular follow-ups and willing to sign the informed consent form. Exclusion Criteria: * Individuals with contraindications to estrogen and progesterone therapy * History of uterine adhesions confirmed by hysteroscopy, or a history of uterine cavity surgery or uterine malformation correction * Subjects who require placement of an intrauterine device or administration of oral contraceptives or subcutaneous implants after the procedure * Individuals with mental status or cognitive function abnormalities who are unable to cooperate with the treatment process * Subjects who, in the opinion of the investigator, have potential risks or any other factors that may interfere with the study.