I had my first ultrasound today at 8 weeks & 2 days. doctor said i had a subchorionic hematoma. can this increase likelihood of miscarriage?

Unfortunately, it does. By UPTODATE: subchorionic hemorrhage or hematoma is associated with increased risk of pregnancy loss, particularly when it amounts to 25 percent or more of the volume of the gestational sac. In a meta-analysis of seven comparative studies, pregnant individuals with subchorionic hematoma had double the odds of pregnancy loss compared with those without (18 versus 9 percent).