implantation bleeding or ?

Okay so last week I had went pee and when I wiped there was a little blood on the toilet paper but not in the pee. Later I peed again nothing on paper. Later again same day blood on paper that time. No blood since then. I never experienced this before. Had unprotected sex during my fertility week. But we haven't planned a child but if we get pregnant we are okay about it.  I'm supposed to start period according to eve yesterday but sometimes I don't start when eve says. What do y'all think