vaginal discharge...

Wilmaris
I still haven't gotten my period and it's been over a month now but I took 4 tests and all were negative, I'm not preggo. I always feel like I'm getting my period but when I go check it's nothing.. I can feel vaginal discharge coming out throughout the entire day.. it's been going on all week, along with cramps.. they feel like pms cramps.. what could this be?