There are two ways to know quickly that you are pregnant: the first is to buy early pregnancy test strips and do the morning urine test at home; the second is to go to the hospital to have a blood test to check the blood HCG, the more accurate and sensitive of these two methods is the blood HCG test. It can be detected by the early pregnancy test after the sperm and egg have been united for more than two weeks. However, if the sperm and egg have been united for about a week, the HCG level can only be detected by a blood test. Therefore, if you want to know if you are pregnant at the earliest, you can choose to go to the hospital to have a blood test to check the HCG level in your blood. If the level of HCG in the blood is increasing, it means that you are pregnant. Of course, a positive urine test or a positive blood test can only prove that you are pregnant. If you want to further determine if you have an intrauterine pregnancy, you will need an ultrasound test.