I was also diagnosed with an SCH after being taken to the hospital with a large bleed at 11+6. I was told my a doctor that I was in the process of having another MC and I was kept in overnight so I could be scanned the next morning, in order for them to confirm. Imagine my surprise when they did the scan the next day and showed my a healthy baby, measuring 5 days ahead.
There is a small risk involved, dependant on size of the SCH and it's position in relation to the placenta and the baby, however, the majorty of pregnancies make it to term. My 20 week scan showed that my SCH is still there but the sonographer said that had I not asked her to measure it, she wouldn't have even mentioned it to me- her opinion was that it would have only caused me unnecessary worry. I'm now 26 weeks and as far as I'm aware, it's still there, yet the baby is completely fine. Have they told you how big yours is, where it is etc.?
I know it's easier said than done but try not to worry yourself too much x