Comparison of Rate of Complete Abortion Between Letrozole Plus Misoprostol vs Misoprostol Alone

Inclusion Criteria: * Diafnoed Early pregnancy loss by TVS according to ACOG Practice bulletin 2018 * GA \<= 14 weeks * Os open \<= 1 cm and no conceptus per os * Hematicrit \>= 30 * Systolic blood pressure \>= 95 mmHg * Informed consent done and can follow up and comunicate in Thai language Exclusion Criteria: * Allerguc to Letrozole or Misoprostol * Intrauterine contraceptive device use * Breast feeding * Diagnoed with ectopic pregnancy or undiagnoed adnexal mass * Severe or recurrent liver disease or AST or ALT more than or equal to 3 times of upper normal limit * Multiple pregnancy * Myoma uteri that involves the endometrium ex. Submucous myoma uteri * Thromboembolism or has a history of thromboembolism * Serum creatinine \>= 2