When did I ovulated according to OPKs

Hi Ladies! I’m trying to determine what dpo I am. I got my first positive OPK at noon on Wed 3/11, then a peak on Thurs 3/12, and still got a positive OPK Friday morning before they started to fade again. I didn’t chart my BBT but had all the ovulation symptoms and pretty sure it happened either Thursday night or Friday morning. If I ovulated Thursday then I’m 11 dpo today and got a BFN :/ Wondering if I’m possibly 10 dpo and it’s still to early to test?...