Worried!!!!

Mercedes
I went for an ultrasound today and we saw the gestation sac but nothing else.... my dr. Wanted to do a hcg quantity and she called me and said that in a week my levels went up only by 100... and on top of it I'm having brownish discharge with very little pink I'm beyond scared and nervous...... any one else has experienced this?... any advice.... prayers welcome. :( :(