Does obesity cause irregular periods?

I have had irregular periods for the past 8 years. Sense my 3 child was born. I thought it was because of having 3 children in 3 years, being on norplant (gained 60-80 lbs on norplant,) (I am approximatly 155 lbs over weight now.)which caused me to have 3 blood clots in my lung. I may have one period in a year and I may have none. Because of blood clots Dr. can't put me on hormones or birth control pills. I had a tubal after my 4th child so I don't worry about that. I guess I'm just wondering if it possible for this to be a co-morbity????

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