The earliest that a blood test can detect pregnancy is seven days after ovulation, and the earliest that a pregnancy test can detect pregnancy is about 10 to 14 days after ovulation. The earliest that a pregnancy test can detect pregnancy is 10 to 14 days after ovulation, and the earliest that a pregnancy test can detect pregnancy is 10 to 14 days after ovulation, and the earliest that a pregnancy test can detect pregnancy is 10 to 14 days after ovulation. A blood test for chorionic gonadotropin is the fastest way to detect an early pregnancy, and can be done within a week or so, but it needs to be done at a hospital. In addition, if you use a pregnancy test, you need to use morning urine about 15 days after ovulation to test for pregnancy. Therefore, if you are planning to get pregnant, you can go to the hospital one week after ovulation for early pregnancy diagnosis.