HCG question. Please help!

Hi all! I have PCOS and my husband and I shave been trying to conceive. I got a vvfl on me 8DPO test, I got my positive on 9DPO and today I tested again at 10DPO and still positive! Last year I had a chemical pregnancy and I am very nervous so I asked my OB if I could get blood work to confirm.. she told me that it is too early and to retest after I missed my period? How early did everyone have their blood HCG drawn? My pcp wrote a script for me but I don’t want to get bad results and panic.