HCG still not 0 rant!

Jess
Just spent two hours in the EPU, after an internal scan they said there is no reason why I am stil getting positive pregnancy tests. They said no tissue left and my hcg was only 700 over three weeks ago so they think it should have got to 0 by now but it hasn't. They said I should wait a MONTH and then go back. Anyone else had a situation like this?? I'm going mad waiting!