Could i be pregnant if i had protected sex (used a condom)the day after my period ended and took plan b the next day? i have a normal 28 day cycle.

Always possible: Despite our best efforts pregnancy is always a possibility when intercourse is involved, though i would say that it is unlikely in this case. I would not recommend taking Plan B as a normal part of your routine, especially when you have taken other precautions. There is only one way to not get pregnant and that is through abstinence.

Highly unlikely: You basically used two forms of birth control. Your risk of pregnancy should be less than 2%.