According to Negative Pregnancy Test, a urine pregnancy test can be taken 10 to 12 days after ovulation. WebMD notes that a blood pregnancy test can be taken as early as 6 to 8 days after ovulation.
Pregnancy tests detect the level of the human hormone chorionic gonadotropin (hCG). A woman's body begins the production of hCG immediately after a fertilized egg attaches to the wall of the uterus. The level of hCG within the body doubles every two to three days that a woman is pregnant, according to WebMD. They also note that results are more accurate if a woman waits one week after a missed period before taking a test due to more concentrated levels of hCG.