Had the scan done they have said there is blood under the sac, they wouldnt tell me anything though

had blood tests done and have to go up for more Sunday to see if the hormone level has doubled if not they have said it could be a miscarriage if it does go up i have to go back in 2 weeks for a scan to make sure its not ectopic.
Not sure exactly whats going on as i kept asking questions but they wouldnt/couldnt give me any answers.