first of all have you had a period since you last had unprotected sex? and the best time to take a pregnancy test is from the day your period is due. If you take the test early before your period is due is could be likely that the test couldnt detect the pregnancy hormone in your urine. and give you a negative result. Some people still get a negative result though even 2 to 4 weeks late from their period because the pregnacy hormone is too low to be detected, but then test a week later and get a possitive result. So if you wanted to make sure wether you are pregnant or not the best advise i could give you is to go and see your gp and ask for a blood test as this can detect the tiniest amount of pregnancy hormone and give you a accurate result. Hope this was helpfull to you, good luck and take care xxxx
Nobody can say yes or no if you're pregnant. It's always possible to get a negative pregnancy test. If you still suspect pregnancy wait another week and retest or make an apt. with an ob/gyn for a blood test and exam.
If you are not pregnant I highly suggest getting on some form of b/c and ALWAYS use condoms.