Not in your DDC - but I too had a subchorionic hematoma/bleed with my third babe (he is now 2 years old). I found out that they are very common, very destressing but typically resolve without any issues. Mine was also quite large - but can' remember now.
I bled at 11 weeks (found out on a routine ultrasound a day earlier that I had a subchorionic hematoma) for several days, and again at 16 weeks. I was with midwives who referred me to a placenta specialist (yes, they do exist at high risk hospitals - referrals required where I live) at 22 weeks who still saw it, was still large but said nothing would come of it. From what I was told, bedrest does nothing to assist with successful pregnancy or prevent loss (sorry). I was told that the signifant majority will resolve without any other complications.
My babe was born at 39 weeks, 8lbs. 1oz. and healthy as can be.
Good luck - I know how terrifying this is.