Help! Please! Has This Happened To You?

I don39t know what39s going on. For about a little over a week my stomach has been hard to the touch, for about a week I39ve been cramping like crazy, then a few days ago I39ve been waking up nasuated and then today (this might be a tad bit TMI) after I used the restroom I wiped and there was a brownish clear discharge. AF is due until July 16 and it39s always 28 days apart. I don39t know what39s going on. Any one else have this happen before?