Subchorionic hemorrhage

Hi everyone! I'm 6 weeks and 3 days pregnant and went to the ER last night for brown spotting. I usually have spotting after sex but this was different so I went to ER just to be safe. The baby's heart rate was a steady 133 bpm and very adorable but they diagnosed me with a large subchorionic hemorrhage. They told me it will either go away, shrink, or get larger and if it does get larger, it could cause premature labor or a miscarriage. I'm terrified now that something will go wrong. I haven't talked to my OB about it yet but will call today. Mines about 2 cm but the yolk sac is only about 1.4 cm so it's larger than the sac and I'm very worried. If anyone has any advice or words of wisdom, I'd really appreciate it. I'm very worried!