Last night i noticed the hood of my clitoris is a dark purple color. it is not swollen or inflamed, just a very dark color. i have had a yeast infection that i havent been battleing for the past month to get rid of that i still have symptoms of sometimes. Also, i am almost a week late on my period. i took an at home pregnancy test about 3 days after my missed period and it was negative. can this all be caused by the yeast infection?