Yes, it is possible for a sonography to detect the presence of a baby even if urine and blood tests show negative results. Urine and blood tests are commonly used to detect pregnancy by measuring hormone levels, specifically human chorionic gonadotropin (hCG). However, these tests may not always provide accurate results, especially in the early stages of pregnancy. Sonography, also known as ultrasound, uses sound waves to create images of the inside of the body. It can visualize the developing fetus as early as 5-6 weeks gestation. Sonography is considered more reliable than urine and blood tests in confirming pregnancy because it directly visualizes the presence of a baby in the womb. There could be several reasons why urine and blood tests may show negative results while sonography reveals a baby. These include testing too early before hCG levels have risen enough to be detected by urine or blood tests, improper administration or interpretation of the tests, or certain medical conditions that affect hormone levels. If you suspect you might be pregnant despite negative test results, it is recommended to consult with your healthcare provider who can order further testing or perform an ultrasound to confirm or rule out pregnancy.