Subchorionic hemorrhage?

Anyone been diagnosed with this? This is my second pregnancy and they saw it on the u/s earlier this week. It's 9mm and she didn't seem too worried but put me on "pelvic rest:" no sex, no orgasms, no lifting 20+ lbs, resting as much as possible, etc. 
I have to go back on the 27th for another scan to see if it's grown or reabsorbed. I haven't had any bleeding or spotting at all so I just think it's weird. Hubby doesn't seem
Concerned and is trying to get me to relax about it.