i missed my period this month(sep). Usually my periods cycle will be 29 days.last month(aug), i got my periods on 19th Aug and this month(sep)it didnt come. i thought iam pregnant. iam not using any birth control pills. But suddenly after 6 days it started bleeding....... I dont know what could be the reason? Also home pregnancy test gave negative result.I did the test on 5th day of my missed period.