subchorionic hemorrhage?!

Lynn • mommy to 3. 6yo, 4yo, & 7months. baby #4 on the way
Went to the er friday night when a gush of blood came out. After a ultrasound a pelvic exam and loos work. My baby was measuring right on point 8w 2d and had a health hb if 176. But was diagnosed with a subchorionic hemorrhage and was told to follow up with my ob on Monday. Has anyone ever had this? And can share an outcome? Thanks!