What Causes White Color Discharge From Vagina Without Penetration?

I ''DID IT'' WITH THIS GUY I WAS TALKING TO BUT WE DID IT FOR ABOUT 5 MINUTES WITH OUTPROTECTION.. ABOUT 5 HOURS I WENT HOME I TOOK A SHOWER.. THE NEXT DAY MY PANTIES HAD THIS WHITE NASTY STUFF SO 6HOURS LATER I WENT BACK HOME AND CHANGED AGAIN CAUSE I FREAKED OUT.. IS THAT NORMAL?