Hcg levels

Ro

I had my hcg drawn and it was 72. 2 days later the test was repeated and it only went up to 84. My doctor said this likely will not be a viable pregnancy. It can either be tubular, molar/chemical, or I will miscarry soon. I’m freakinggggggg out. Has anyone went through something similar and went on to have a healthy pregnancy? I am only 3 weeks and 6 days