Can you have periods while pregnant?

at the begining of Jan. 2008 my boyfriend tryed to get me pregnant we've been tryin for a year but i never worked... we stoped tryin and just thought a baby maybe wasnt the best idea then planed somethin different..... every month sence i was 13 i had hevy periods 5 days a month idk why but feb 2008 i had a 2 day period one hevy one light i dont have sickness usly i eat about a full plate or plate and hafe now im having loss of appetite i eat less then i should but last night i ate more then i eva did and im feeling tired alot and lazy am i pregnat? or me thinking that i might be is a fig of mi imagination?