At how many dpo do you start noticing symptoms?

Brandi-lea • Khaleesi-May Dizney Van Vliet - my precious daughter born on 23.6.15 👶🏼🌸
What dpo do you normally start noticing symptoms? 
​Does everyone get implantation bleeding or can you still be pregnant without it? 
​What is the earliest you can test and possibly get a positive?