June 4th. I had sex, I had completely normal periods in July, August, and September but I missed October. I have been stressed lately and just started up a new job. I have been sick a lot too. What do you think is going on, cause I'm freaking out! Its November 8th now.

Have you had sex since June? If so then wait two weeks from the date of your missed period and take a home pregnancy test.

IF you haven't then it is stress and sickness, those will wreak havoc with your cycle.