Beta-HCG Levels in Uterine Cavity Lavage for Pregnancies of Unknown Location

The goal of this interventional study is to investigate the role of beta-hCG levels in uterine cavity lavage for differentiating between ectopic pregnancy and early pregnancy loss in female patients aged 18-45 years. The main questions it aims to answer are as follows: 1. Can beta-hCG levels in uterine cavity lavage provide a decisive cut-off value for distinguishing between ectopic pregnancy and intrauterine pregnancy (early pregnancy loss)? 2. How do beta-hCG levels in uterine cavity lavage compare with venous blood beta-hCG levels and pathological results, final diagnoses? Researchers will compare beta-hCG levels in uterine cavity lavage to pathological results and final diagnoses to determine whether this method can provide a quick and accurate differentiation between ectopic pregnancy and early pregnancy loss. Participants will: * Undergo uterine cavity lavage with 5 cc of saline solution before anesthesia and probe curettage * Have 3 cc of aspirated liquid collected in a gel tube for beta-hCG level measurement * Proceed with the scheduled probe curettage procedure The study focuses on patients with positive serum beta-hCG values, serum beta-hCG levels below the differential level (\<1500-2000 mIU/mL), abnormal beta-hCG progression in consecutive measurements, and inconclusive transvaginal ultrasound results for differential diagnosis.