Smelly ... quite alot of discharge?

my is quite smelly bt ive never had or anything so i know its not an sti. but its really bad & gets really bad before my period. other people have noticed but not noticed its me and like i think it smells garlicy, and sometimes like biscuit :S its weirdd...also i get wet dischage lke you cant see it but its dead wet n sometimes if ive only got tights on it goes onto the chair and leave a tiny wet patch. no abnormal itching or anything...x