I had my tubes tied after having my ninth child and after a year of regular periods. I jusr recently had two in one month. Anything to be worried abou?

Call your physician. Any change in your cycles should be discussed with your physician.
Irregilar cycles. If this is the only time you have been irregular then i would monitor your cycle for repeated episodes. This is only true after you have had normal pap smears regularly.
Probably not. You do not mention your age, but it is not unusual to have mild irregularity. The tubal procedure is unlikely to have much effect with it, and the fact that you had 9 children is more likely to have an effect.