Has anyone had their HCG levels drop early on and still have a healthy pregnancy??

I was 13 dpo last Monday and had a blood test @ my doctors office. My HCG level was an 8.

I had a chemical pregnancy in September, so she is being extra precautious and had me come back for repeat blood work on Wednesday (2 days later). My HCG was 20, which is good. My doctor said it should double about every 48 hours.

She had me come back today to retest my levels and my HCG was at 14. I have called the office 2xs and they said they are waiting for her to review everything and asked if I have had any cramping or spotting/bleeding (which I haven’t)…..

Has anyone else had this happen?