doc said I'm going to miscarry

My hcg numbers dropped last week, but here I am no bleeding no cramping no nothing! Is it possible for my numbers to fall a little and not miscarry? Anyone have stories of their numbers falling and them not miscarrying? If it's inevitable and going to happen I wish it would just hurry up and happen! We were just told 2 months ago that my husbands sperm count was so low that he would never get me pregnant naturally and we'd have to do IVF and right before we started the process I found out I was pregnant. After 3 years of trying. I was hoping this was our miracle. I'm still holding on to hope till I start bleeding but that'll prob make it worse emotionally.