At 13dpo (3+6), my hCG was 38. Dr said it was just leftover hCG from my last miscarriage 5 weeks before. 17dpo (4+3), my hCG was 236 and doubling normally so a new pregnancy was confirmed but my dr was predicting miscarriage because 1. I "got pregnant too soon after my last loss" and 2. my hCG was 'too low'. She's now my former doctor and I'm 37 weeks pregnant. Baby just kicked me and is currently headdown on my bladder. As a pp said, it's not so much the number itself at this stage but rather how much it's rising.