Low HCG

So about a month and a half ago I got pregnant and it was my first time ever being pregnant. About my 3 week of knowing I was pregnant I had a miscarriage. It was really hard for me and my fiance. We found out after words I have a low HCG and I'm not really sure what I'm supposed to do to raise my HCG level. Is there anyone who has gone threw something similar? And has any ideas?