Precious sorry to hear. It happened to me and in the end I stopped the pessaries. The hcg was so low intuitively I thought it wasn't going to increase.
Dee 8 is ok but remember it will grow some more from now till Monday. Plus it depends on the clinic some will say it has to be over 6, others over 8, my acupuncturist is adamant it needs to be over 11. Mine hovered between 6 and 10 (from what I remember). I do believe taking big doses of vitamin e for 3 months helped it a lot the last time when I did fall pregnant.