HI,
   I understand your concern.
   Your first 
HCG was tested  hardly after 4  weeks of last menses.  at that stage, HCG can be anything between 25 -425 mlU/ ml You have 399 , that is in normal limits. In 
pregnancy HCG doubles every alternate day.. so your second reading of HCG was also normal.
    Now, the point of concern is pink colored discharge & past history of 2 miscarriages. miscarriages at so early pregnancy  suggest.. Progesteron deficiency / blighted ovum/ ectopic pregnancy.
    *  The cause will be clearly evident after 5-6 weeks of pregnancy by USG scanning. Till then, you should- 
     - Consult a gyneologist & with her advise start taking  
progesterone supplements along with 
bed rest,( Expectantly ). avoid physical/ psychological 
stress. This will mostly stop the problem. 
     - As per your doctor's advise, after 5 weeks you should get your USG done.. which will confirm the problem.
     -  Follow the treatment your doctor prescribes following the USG reports.
   Thanks.