pregant ? period ? or what the H?

So eve says I'm supposed to start my period today the 13. But I spotted brown discharge yesterday on the 12 and I wiped and there was blood but not a lot . Well I slept with a pad on and went to the restroom this morning and had no spots/spotting in the pad . Nor did I pee out blood like how we do when we're on our period . Not to mention I have had unprotected sex like 3 days before but he doesn't finish in me . Can I get some help ? Could this be pregnancy implation maybe ?