Brown discharge

Yazmin
So I'm suppose to get my period next week since my period are regular my boobs are usually sore the week before and that's how it's been but this morning when I went to the restroom and I wiped brown discharge was on the paper. I usually bleed brown at the end of my period never at the beginning plus I've been having cramps for 4 days now and I never get cramps. Has this happened to anyone else?