I do but I do not recommend it. 10dpo is much better. Keep in mind 9dpo is the most common day for implant so your chances of a false negative are so high at that point that it just causes too much stress. Getting an early bfp depends on how much hcg your fertilized egg is producing at implant, when implant occurs, and your doubling speed. So some women do get early bfps. My earliest was 8/9dpo with a singleton. My twins I had super squinters 8-9-10fmu and got clear lines 10smu. The others I was late before I tested so can't say. Gl!