Background and objective: Defined as the collection of blood between the chorionic membrane and the uterine wall, subchorionic hematoma can be associated with adverse pregnancy outcomes and even miscarriage. The present study was carried out in order to evaluate the effects of first-trimester subchorionic hematoma on pregnancy outcomes. Patients and methods: The present study was an observational prospective case-control study which was conducted on 200 pregnant women in Erbil teaching hospital, Erbil, Iraq over a period of one year from April 2019 to April 2020. The women were assigned into two groups, a case group consisting of 100 women with subchorionic hematoma and a control group including 100 women without subchorionic hematoma. Required data were collected based on the women’s full history and examination. The collected data were analyzed using the Statistical Package for the Social Sciences (SPSS version 25.0). Results: age of most of women in our study was between 20-30 years old, although we couldn’t find any association between subchorionic hematoma and age of the woman. Most of the cases (97%) and controls (95%) did not smoke (p-value=0.721). The cases and controls were not significantly different in terms of miscarriage, most of them did not have miscarriage (p-value=0.182). The results revealed a significant association between current miscarriage and history of previous miscarriage (p-value<0.001). The cases and controls were not significantly different in terms of 2nd and 3rd trimester vaginal bleeding, mode of delivery, intrauterine fetal death, newborn admission to NCU, congenital anomalies, age, parity, Apgar score in first minute, and Apgar score in 5th minute (p-value>0.05). However, they were significantly different regarding their birth weight (p-value=0.12). Conclusion: There are no significant correlations between having subchorionic hematoma and miscarriage; however, the odds of miscarriage are slightly higher in women with subchorionic hematoma. Newborns of women with subchorionic hematoma generally have a lower birth weight.