Testing really depends on when you ovulated? Do you know when this was? Its best to leave it until 14 dpo if possible!
I gave in and tested at 8dpo with 10 MIU internet cheapie and got faint positive, it then drove me absolute nuts, testing everyday, sometimes twice a day to see if the line got any darker!
Luckily for me it did and 14dpo got my BFP on a clearblue digital!
I would wait to test until your AF is due, I promise you its more stressful testing early, than it is waiting a few days!
I didnt have any implantation bleeding, and had very few symptoms - my main symptom started at 10 dpo, and was a very weird stretching ache sensation in both ovaries, which I still get now!!
Lots of luck and hope you get your BFP