Gestational Trophoblastic Disease

Hi-
I had a D&C in November.  My HCG had been dropping, but very slowly.  Two weeks ago it was at 13 and this last week is was at 15, which is the first time it has ever gone up.  So, my doctor became concerned and I had a bunch of blood work done and another ultra sound, and a chest x ray.  She is thinking there may be tissue somewhere in my body still producing the HCG.  I wil lfind out results from my tests on Monday.  I am concerned that I will need to take this chemo medicine to get my levles down.  Anyone else experience this?