I need help!!! I got a vvfl at 10 dpo and at 11 dpo it was a little darker since i have been through multiple fertility treatments and a missed miscarriage I immediately scheduled beta labs. My OB nurse is saying its chemical after 13DPO. Should i have hope levels below.

11DPO-15HCG

(11 and 12 DPO slight brown implantation bleeding)

13DPO- 15 HCG

15 DPO- 37 HCG

18 DPO-79.5 HCG

I am having no other symptoms of miscarriage and have never seen a positive test outside of a fertility treatmeny setting. Help i am driving myself (OB office too) crazy. I just dont understand why its still rising if its chemical.