Subchorionic bleed

So I'm 7 weeks, 5 days along with my second. Had my first ultrasound and the baby was measuring 8 weeks along with a heartbeat of 171.2. The technician said I have a subchorionic bleed (pool of blood) in my uterus. She said dont be too concerned it fixes itself usually. And today I have been having little pink discharge and some cramping and I'm so terrified. This never happened with my first. Anyone have this before? Any stories that turned out good? My doctor wont see me again till 3 weeks from now and I'm trying so hard to keep it together but it's really scaring me.