Welcome to HCM.
As you have been using Diane 35 regularly, the chances of you getting pregnant are very less as the failure rate is 1% per year.
People with irregular periods
can conceive as well but it difficulty lies in the calculation of fertile period, which is often difficult.
The best method for you to regulate your menstrual cycle and to get pregnant is using estrogen
pills during first 14 days then followed by progesterone
only pills during the later 14 days. This helps in maintaining the normal physiological function of menstrual cycle( Physiologically Estrogen is necessary for first 14 days at the end of which ovulation occurs and progesterone during later 14 days at the end of which your periods start. In case the fertilization occurs your periods wont come).
Hope this should work for you. But See a gynaecologist and discuss about the about mentioned treatment strategy. Along with that the possible cause for irregular periods also has to be found ( PCOS, hypothyroidism
, high prolactin
etc.,) and treated accordingly.
Wish you a healthy life and hope you conceive soon.