Lightly bleeding a week before my period, am i pregnant?

my name is alexis.. i'm 18 years old.. and this would be my first time bein pregnant. it's young, yes i know. I've been nauseous for about two weeks now. if i am pregnant i would have concieved june 6th. i woke up this with a tiny bit of light red blood in my underwear. i'm supposed to start my period on the 29th. i don't have any cramps, but a lot of cravings and i'm starting to gain a little weight, and my breasts hurt allllllll the time.. could i be pregnant? and is this plantation bleeding? please let me know, i'm kind of freakin out.