9 DPO HCG level

Alexis

at 9 maybe 10 dpo my HCG was at 23, and 2 days before the test I had a quick stabbing cramp and a spot of brown blood in underwear so assuming implantation then. My doctor is not concerned about he number because it's so early but I'm still worried. My last pregnancy i was at 16 at about 14 DPO and miscarried. She has me on progesterone right after BFP. anyone else have a low number this early on and was Okay??