Freaking out! I think I'm having implantation bleeding but I'm not sure.

My husband and I really think we timed everything perfectly. We were intimate on a on August 27, 29, and 31st. And I had a bright ovulation test September 3rd. Now i think I'm 11 days dpo and I had brown discharge and small brown colored streaky spots on my undies and when I wiped it was a very light pink. Has anyone gone through this ? Can anyone give me advice what to look out for and when to take a pregnancy test???  Thanks !