My period is about 11 days late, and I recently had pink discharge. I read that it could be implantation bleeding, but I've never had sex before. Why hasn't my period came yet?

I've never had sex or have been naked around my boyfriend. I want to wait. We participate in outercourse, but I still fear the possibility of pregnancy. I've been stressing about being pregnant for about a week, and I've read every article ever written on the subject. I need some reassurance.