HEY ! ladies i have a question. has any one experienced this; ok so my period was last week on the…

HEY ! ladies i have a question. has any one experienced this; ok so my period was last week on the 16th - 18th i have a short period and it ended mid day on the 18th i know for a fact that i was done . now a week later which is today i had sex with S.O. and i started bleeding but not like a period about .i know i didn't tear bc i would have felt it. but it was a decent amount to were it freaked me out a but and the TMI i know but the blood was bright... so if anyone has experienced this or knows anything leave me a comment below i have a regular appointment on Monday nd im going to talk to my doc but i just want to hear if someone else has had this happen before