(Tmi maybe) Spotting. Please help.

Tere
Ok so I went to pee earlier and when I wiped, I saw blood. I've been going to the bathroom all day because I started drinking more water but I haven't had anything. It was very light, sort of pink. I had my period on the 8th. I havent had sex during my fertile days except two days ago but we didn't finish. Can someone help me explain what this could be?