I have had a headache for a week. I also broke out with some acne on my face. I thought I was Starting my period. Well 3 days ago I started getting light brown spotting. Never have I had this happen before. It's usually only after I've been on my period for at least 5 days does it start to look brown (sorry tmi) . I have no other symptoms. Excessive thirst really. My period is usually 7 days full blown heavy period. I don't think I could ever get pregnant. I've been with my fiancé for 2 years now and never had a pregnancy. I am std free so I know it's not cause by anything like that. Could it be stress?