Please anyone have any ideas why

So I have been on any type of birth control for almost two years and I seem to be having some issues I want to be able to have a baby but my periods are all over the place like in over six months I have only had one cycle that has been 26 days otherwise is is usually around 30 some days but every third cycle I like skip over it and there's been cycles that have been 86 days long and I just don't know if anyone has any ideas I would be so happy I know I am going to maybe try some ovulation tests here with my next cycle because I don't even know if I'm even ovulating(learn more on Glow: https://glowing.com)