subchorionic bleed?

Jessenia • Jessenia 💕 1 Mc 02/17/16 💔👼🏻 Expecting Baby #2😍 Rainbow baby👶🏽 🌈❤️ Dec 2016 ❤️
Got an sonogram and they told me their is a very small amount of blood between the baby and The uterus wall. Which is 

subchorionic bleed. Is this bad ? Will it cause miscarriage???