Help! Negative test, pregnancy symptoms

I have been expierencing pregnancy symptoms for a few weeks now, missed period, nausea, dark purple nipples, white discharge, mild abdominal cramping, spotting, extremely tired, and sore boobs. If I concieved it would have been five weeks ago. I took a pregnancy test today and it came up negative. I'm 17 and have no idea what to do now.. Any advice..?