Hi, I am a 20 yr old female and I m sexually active, now normally my period always comes either the middle of the month or the end and always lasts 5-7 days but my last period only lasted 3 days I thought it just simply stopped because sometimes ot does that but it always starts back up again and this time it didn t. I m somewhat concerned that I may be pregnant, I have notices that I have been tired more, loss of appetite, and with a couple of foods I have ate their was a metallic taste. I m not too sure what s going on