I agree with Kim1989. You didn't say anything about missing a period, or any other symptom. If it has been four weeks you should show positive on a pregnancy test if you are in fact pregnant. If the condom broke, whether he ejaculated or not, you could be pregnant. Take a test.
its been over 4 weeks....why havent you taken a test....and if you were to get pregnant at the time of ovulation....you would have missed a period two weeks ago.
dry nipples that itch is not soly a sign of pregnancy...its a sign of dryness.
you did not say you feel sick, or tired, or moody, or crammpy, or miss a period
you did not take a test...thats where you should start. anything else is a guess but if your only having dry nipples that are itching because their dry......and your not getting a postive hpt...your not pregnant and should not be worrying