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 examinationwithin three days prior to the surgery shows a gestational sac (average of threediameters) 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 TreatmentGuidelines and Technical Operation Standards: Family Planning Volume (2017Revision)"

• 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 uterinecavity surgery or uterine malformation correction

• Subjects who require placement of an intrauterine device or administration of oralcontraceptives or subcutaneous implants after the procedure

• Individuals with mental status or cognitive function abnormalities who are unable tocooperate with the treatment process

• Subjects who, in the opinion of the investigator, have potential risks or any otherfactors that may interfere with the study.