Suggest Dosage Of Novalan To Prevent Pregnancy

I have been having irregular periods since the last few months. I have also consumed the emergency contraceptive pill a few times during this period. I haven't been taking any kind of birth control pill before that since intercourse was pretty irregular. Its been a week since I got married. I want to get on Novalan now. Is it advisable? I am 26 years old. what are the dosages? And for how long do i need to continue it?