Hcg level decreases

Arra

My estimate is I am 4w5d and my hcg was 474, 437, 394 and my nurse told me that it is a possible miscarriage nonviable pregnancy. And they said im too early to do a ultrasound! This is my first pregnancy and im so scared. Anyone experience this and have a successful pregnancy although out? What to do to increase my hcg? Been testing every 48 hrs because im scared that my lines will get faint and they are all dark.