5 weeks low hcg levels

Tasha
I found out I was pregnant after TTC for quite a while! Did blood work on Wednesday and it was in the 7000s...blood work again on Friday and it only rose like less than 100...doctor said I will miscarry. I've been praying all weekend that this miracle in me will grow, and healthy at that. Had a follow up for blood work today and my hcg is 13907. This excites me cause it rose! However, my doctor did a sonogram and said there's no blood flow in the pregnancy sac. Along with the hcg not rising as they believe it should he's still for sure I will miscarry. You guys I do not want to give up hope and am still praying for a miracle. Am I crazy?