I would say if the condoms were used correctly then pregnancy is probably not the case. You may be late due to stress as you havent yet got your period. I would wait another week and if you period hasnt arrived go to the doctors to get looked at just in case and do not take the pill until you have started your period!
I would venture to say that you are probably not pregnant if you have been using protection...although it's not 100%. If you don't get your period in about a week, I would go to the doc and get a blood test. You could have just ovulated later than normal, and that is what would throw off your cycle a bit. Just wait and see, and don't start the pill until you know for sure. Hope that helps you!
I would proberly hold off on starting on the pill until you know for sure ,
and also i would wait about 1 more week if you still havent recieved your period
i would go to the doctor to make sure there is nothing wrong , it might also be a result of
stress , that can sometimes make a period late.
Hope that helps u out a bit .
Cheers