Help!! Hospital have just phoned...

Claire
Cut a long story short found out I was pregnant in hospital... Had a ruptured ep in January so they wanted to monitor me as early on blah blah so I've been having my hcg ever 2 days.... So they started declining & a miscarriage was confirmed almost 3 weeks ago they left me a week then called me back to make sure hcg hit 0.... Only for them to drop the bomb shell that they had started going back up!! They've just phoned me to say that they are still going back up just not the way they want them to... I'm off for a scan tomorrow but they don't know what's going on... Anybody had this & head a healthy pregnancy??