i was on birth control and i came off it on august and my last period was august 20th 2007. and on September 11th, 2007 a brown thing i past out and the following day i had my period. and the next day it stopped. the brown thing came back again September 23rd, 2007 and i had cramps and i am still having cramps and the brown thing also . can some one tell me if i am pregnant? and if i am why is this happening?