The month of September I did not get my period... I usually get it in the early 20s... The month of October came n I got what I thought was my period but instead of coming in da mid 20s it came on the 5th n by the 8th it was over! It only lasted 3 days... The 1st day it was a bit heavy the next 2days it was light... This month the same thing happened but my period came on the 3rd 2 days before the 5th n by the 5th it was over... When it 1st came I started 2 spot brown then it got light red... Since mid September I had felt nauseous but it went away! N when October came the whole month I would wake up n the whole day n when I went 2 bed I felt my stomach very uncomfortable n like if I had 2 throw up! So far since da last 2wks of October n the beginning of this month I have thrown up approximately 4 times... Could this mean that I am pregnant?? =/

Have you tried a pregnancy test? If there is a chance of pregnancy, and your periods have been off from their norm, that would be the first step.
Periods can shift schedule for a number of reasons, but pregnancy obviously needs to be either confirmed or ruled out.

Yes I took a pregnancy test and it came out Negative

Might be an illness, which could throw your cycle off, but if you are normally pretty regular, you may want to see your doctor about having a blood test.