<prompt> Fetal cardiac activity is detected with Transvaginal USG as early as?6 weeks8 weeks10 weeks.12 weeks  <response>: 6weeks REF: USG in Obstetrics Gynecology by Callen 4th edition page 119-120 Fetal cardiac activity is detected as early as With Transvaginal USG 6 weeks of gestational age With Transabdominal USG 