After ART (assisted reproductive technologies) cycle the most valid way to determine pregnancy is ultrasound diagnosing of fetal heartbeats, which can be registered from the 6th week of pregnancy. Less valid method is the HCG blood test (it determines pregnancy only given the absence of HCG medication support of the second phase), which is conducted on the 10th-12th day after ET or urine test (determines pregnancy after 12-14 day after ET).