Should I take a test ?

Ok so first things FIRST yes Ive been having sex but my bf he doesnt nut he just precums very often. Now this week I have been feeling sick, if I smell cheese or anything really that smells sour, dead or old.  Yesterday I woke up and my breast were sore, I think I may have a yeast infection... I cant tell because im soon to get my period but I feel this weird tingling itching but yet burning sensation and its very uncomfortable how ever no cottage cheese discharge...  I want to wait for my period which is in a couple days (3) too see the blood color if it changes or what not. But my question is should I be worried ?!