Gynaecology & Obstetrics In transvaginal ultrasound, earliest detection of gestation sac is by : A 21 days after ovulation B 21 days after implantation C 28 days post ovulation D 14 days after ovulation 💡 Explanation In transvaginal ultrasound, earliest detection of gestation sac is by : ✓ Correct Answer: D. 14 days after ovulation