I been on birth control for a year I came off it august I see my period september but not october is this normal.?

Irregular bleeding. It's not unusual to have irregular cycles after stopping birth control. A pregnancy test is ideal, no matter what the situation is. If you are not pregnant, it is ok to wait to see what happens after 2-3 months. Depending on how long you have been on BC you may now be experiencing a problem that was covered by the cycling of the pill, like PCOS. See your Dr if it continues.