What could be wrong??

Im 30 years old and had what i would say an unusual period last month.. nothing like it normally is... so far this month i havent had one at all. Im 99% sure im not pregnant.. I've had my tubes tied for 3 years now. I know there is a slight chance of still becoming pregnant... but i havent had any symptoms or anything. Some say stress can cause it, but I dont feel like i've been stressed lately. Anyone have an ideas of what might be going on here and if it could be serious?What could be wrong??
Ur just having irregular periods it happens to us
You did not describe what you meant by "unusual". If you are talking about excessive bleeding, there can be lots of causes, and only your doctor can figure that out, not somebody on Yahoo.