Kat, you have asked this question before and it has been answered.
We could not even begin to guess at what your chance of pregnancy is. Your cycles are irregular and we are not able to tell every single woman her personal pregnancy risk.
I hope you are not pregnant. The only way you can know is to take a pregnancy test. However, the chances you are pregnant from what you say are very low. Relax.
You should go to planned parenthood and get informed on pregnancy and birth control.