why is my period so random all of a sudden?

[nycmom18]

I have NEVER skipped a period in all of my 17 menstruating years.  Last month October, I thought I was getting it early, but then I thought maybe after nursing for 2.5 years, I'm finally back to my 28 day cycle.  Only it was very light for 3 days and then it came normal for 5 days after that.  I normally have my period for 5 days only.  I was also very stressed, so I thought maybe that was why it was wacky.  

Now this month, I'm a little early again, and I thought it started 2 days ago, but I've got nothing.  its like I spotted.  I had taken a preg. test a week ago which was negative, i dont feel pregnant, and we are very careful with planning/or trying not to get pregnant right now.  

if im not pregnant, not really stressed, havent changed my eating habits, except trying to eat more, what could be the cause for this randomness??

[subtlycrunchy]

Hope you find some answers! Passing along this helpful article from Women to Women:

Answers to your questions about irregular periods — and the natural way to maintain a more regular menstrual cycle.