Miss 3 pills in first week and had sex without pulling out period ended 5 days ago what are the chances i could get pregnant?

Likely very low: If you have had your period than the chances of being pregnant are very low. You cannot be preg after having a period. But in the future you might need another form of birth control. I would recommend you talk to your doctor about and IUD or an implantable form of birth control. Both an IUD or an implantable work for over 3 or more years and you don't have to remember everyday to take a pill.