So last month my period lasted a day and this month i only bled for 3 hours ive been on birthcontrol pills for a year could i be pregnant??

Hmm: Probably not if you've been taking your birth control as directed. Some women will not cycle while on birth control especially if you are taking them continuously (no placebo pills). If you are worried about being pregnant, get a home pregnancy test form your local grocery store or pharmacy. They are cheap and very accurate. Organizations like Planned Parenthood also provide free pregnancy tests.