spotting..

I've been spotting once to twice a week for about a month. I took plan b, had a yeast infection and my period all in one week on my last cycle..I'm about a week out from my next cycle.. I don't use any birth control and the spotting isn't heavy it only lasts for like one or two bathroom break each time it's happened in the last month. I will admit my diet and water intake hasn't been the best and my stress levels are crazy high lately.. anyone have this problem? could this be from all the stuff that happened on my last cycle plus the stress?