Hello! For The Past Week, I Haven't Had Much Of

Hello! For the past week, I haven't had much of an appetite and I've actually lost like 6 lbs. I got my period on Monday and usually they last like 6 days and this one only lasted 2 1/2 days. 2 heavy and th 1/2 there wasn't really anything. I was just wondering if there was something going on with me?!