Update from this morning brown blood , cramping, low back pain.

I spent a good 4 hours in the. ER. Ultrasound showed sac and baby but really small and there was no heart beat. Labs showed quantitative levels at 4,000. MD said could be really early to see the heart beat. If it doesn't stop I might lose the baby?. Said to check blood levels Thursday to see if they went up if it didn't something serious is wrong and I could miscarry. I'm still cramping and have low back pain and mildly bleeding don't know what to do??? All of you in need your prayers it's out of the doctors or my hands now.