I started having a brownish pink discharge and I don't know if that could be implantation bleeding

I am 21 years old and had my last period September 18 and it ended around sept 23 and now it is the 30th of September and had unprotected sex with my husband he pulled out. ( I know that's not a form of birth control) but now it's the 30th and I started having a brownish pink discharge and I didn't know if it could be implantation bleeding my next period won't be for a little over two weeks?