Late period

I am 5 days late for my period and there’s drops of brown stuff on my pad but when I wipe it’s pink... it’s been 2 days since I’ve had this stuff coming out.. it’s not a lot just a little.. & I’m cramping lightly cramping I’ve been cramping all day like it’s my period or something but it won’t come.. my boobs aren’t crazy sore and at night I go to bed really exhausted so sleep and wake up then sleep some more

& my lower back hurts when I sit down for a while

& the last time I had unprotected sex was November 9th (two days after that I had my period)

Has this happened to any of you?