Inclusion criteria:  Maternal age :18-35 years Gestational age: up to 12 6/7 weeks of gestation (confirmed by a reliable date for the last menstrual period or /and 1st trimester ultrasound scan). Singleton miscarriage Type of miscarriage: Incomplete or Missed miscarriage Surgical evacuation will be done within 2 weeks of diagnosis of miscarriage .  Exclusion criteria:  Maternal age: younger than 18 years Induced miscarriage of pregnancy Septic miscarriage Evidence of infection Morbid obesity (BMI≥40kg/m2) Allergy to prophylactic antibiotics (i.e., doxycycline or metronidazole) Antibiotics use within 7 days before randomization