Objective of the study was to analyze effect of threatened miscarriage on pregnancy outcome and correlation with ultrasound parameters. It was a prospective study conducted over a period of 3 years, including 284 pregnant women with bleeding per vaginum during first 12 trimester of pregnancy. A structured proforma was used to collect information and followed till their pregnancy terminated. Out of the 284 women, majority were primigravida (65.1%), 19.7% had history of previous abortion & 32.4% were associated with medical disorders.38.7% presented with bleeding at <8 weeks .30.6% of women had sub chorionic hematoma in USG. Incidence of spontaneous miscarriage was 22.2%, 80.5% had vaginal delivery. PROM/PPROM (9.51%) was most common maternal complication after 24 weeks. Among perinatal outcome, preterm birth seen in (13.1%), perinatal mortality 2.71%.To conclude, pregnancies complicated by threatened miscarriage are associated with higher risk for adverse pregnancy outcome. Knowledge of these risks help obstetricians provide proper antenatal care and do timely intervention.