Is this normal

soo i never post on here but everone seems very helpful so here goes my first post so stick with me, okay so i had my period last week and it ended on monday it was a normal length period everything normal, so today i used the bathroom and i saw red in my discharge it looked like normal blood not like old blood, and i dont know what it is or where it came from , i have never had this problem im nervous is this like a normal thing or do i need to see a doctor