Contraceptive pills

Hi all! I was suffering from severe ovulation pain and I started taking lo loestrin since may 2015. Everythn was good until this month, after Finishing my old pack, I had a week gap before starting my new one. And as a result, my ovulation pain started unbearably. I read online but I was unable to get the instruction. Can anyone of you guide me about how to take my missed pills?