Bc and irregular periods

Victoria
Ok so i stoped taking my bc in January so about 4 months now I'm ttc... I'm not sure i am even ovulating... but my cycles have been 21 days then 28 and now 24 is this normal? How do I regulate it and how do i know if I'm ovulating? I have tried temping but I don't think it will work very well for me because of my sleeping habits and DH. I'm so confused but ready for a baby. 😡