I missed pills in my first week of the pack and so I took two today and plan on taking two tomorrow so I will be back on track and one regularly for the rest of the pack. After this I will abstain from sex or use back up protection for the next seven days. The only problem is that I didn't realize I missed them and had sex yesterday without any other protection. Is the risk of pregnancy very high? I am on tri-sprintec birth control.what should I do?