Worried

My last cycle begin on 2/16/2007 and I bled for 8 days....did a home pregnancy test on March 6 came back negative and another one on March 21, which came back positive.  Had my first vaginal sono on April 25 (9w6d)....doc could not see heart beat and hcg levels was 34403....went back three days later for blood work only and hcg levels  went down to 25897.  Had another doc appt a week later (May 2), and doc said yolk sac shrinking and still couldn't detect heart beat...the day before I had little spotting when wiped.  I have been spotting on and off since may 1st and had light cramping on May 4.  I also have a tilted uterus and still hope something shows up on my next appt which is May 9. Any one have similar diagnosis......

This should under topic pregnancy issues