weird discharge

today I had an sticky transparent discharge, kinda watery with a very very light brown. I'm 9 dpo, I had sex the last day of my period, I have cycles of 30-35 days. I've been having the feeling that my period is about to come out during the day, but nothing comes out, and it's actually a week away. Could it be implantation?, when can I take a test? my last period was on the 28th last month, it lasted 3 days.