Gynaecology & Obstetrics Fetal hea can be detected earliest with trans-vaginal sonography at (from the last menstrual period) : A 35 days B 38 days C 53 days D 46 days 💡 Explanation Fetal hea can be detected earliest with trans-vaginal sonography at (from the last menstrual period) : ✓ Correct Answer: D. 46 days