It is possible to detect pregnancy in one week. Theoretically, one day after the fertilized egg is created, the level of HCG in the pregnant woman’s body increases and then continues to rise in a daily multiplicative manner, so the level of HCG can be detected in about one week of pregnancy. Both the early pregnancy test and the blood test performed at the hospital in the early stages of pregnancy test HCG levels. The early pregnancy test is to detect the level of HCG in the urine, while the blood test is to detect the rise of HCG level in the blood of the pregnant woman by drawing blood.