okay i have a question, i just started working in retail and i am on my feet for 6, 7 hours at a time. my period went from 4 days always normal to 2 maybe 3 days with only somewhat heavy the first day and very light the next too. i did have a scare with being pregnant but all the tests say im not. im very confused and dont erally know what to do or how this could be happening.. can someone help?