If you are having 28-30 day cycles, your ovulation time falls around the 14th-16th day. That will be around six days ago. Since you missed that period, your chances of pregnancy
are little. Also, you have a protection that is highly effective. So, do not worry. You should go to see your doctor for a checkup after you have your cycle and if you are still in doubt, you may get blood tests done for confirmation. Please get further advice from your doctor. Take care.