HCG level dropped

Anyone experienced their HCG level dropped and still went on to have healthy pregnancy? Just need a little light at the end of the tunnel. Although I am preparing myself for the worst news possible. This would be my 5th MC.

Sometimes I wonder why am I not good enough to be a mother.

My first HCG test was 21,675 mIU/mL

Second test 3 days later came out to

19,795.8 mIU/mL