How early will a transvaginal ultrasound detect pregnancy?

Home Tests - Urine

Pregnancy can be discovered very early on with some of the new pregnancy tests. Some home tests can detect a pregnancy within days of conception however the further into the pregnancy the more accurate the test. The accuracy of the test relies heavily on detection of the hormone human chorionic gonadotropin (hCG)and the amount that is released. This hormone is not released until implantation of the blastocyst in the uterine wall which usually occurs around day 6-12, still the amount of hCG may be too weak to detect at this stage but not impossible. False negatives are very common at this stage (prior to a missed menstruation) therefore it is suggested that if you test negative to test again in another week or two. A positive result at this point is rarely false.

Laboratory Tests

Detection of pregnancy can occur within 48 hours of conception using more complicated testing methods, usually performed at a laboratory. These tests are generally considered cost prohibitive.