Pregnancy tests work as soon as it detects the presence of the human gonadotrophin hormone in the body. As has been reiterated before, it is important to be patient, even as you want to get pregnant desperately. You do not want to get disappointed so many times as to start your pregnancy on a bad footing. You will have a positive pregnancy test one to two weeks after you have had unprotected sex-assuming that fertilization took place. It is important to get a true testing, whether a true positive or negative. When you and your partner do not have to struggle with other things such as erectile dysfunction and low sperm count, you can be sure that you do not have to worry about your prospects of getting pregnant. Take your time and do not raise anyone else’s hopes up until you are sure that you are pregnant and you have a positive test from the doctor or from a positive pregnancy test at home. The human gonadotrophin hormone is released into the body after the implantation, to assist in the survival of the pregnancy. It will be present in the blood and in the urine samples, that’s why pregnancy test kits from home will test for its presence in the urine. Still though it will be released after one to two weeks, since this is the time it takes for the egg to get fertilized and implanted into your uterus.