I am 37 years old, single and definitely not pregnant, my last period starts June 2, and when i go to an OB Gyne, she ask me to undergo transvaginal ultrasound but i askeed her to give me medications first, she advised me to take duphaston 10mg twice a day for 10 days, I finished taking the pill last monday..Just wanted to know how effective duphaston 10mg is and do i really need to undergo transvaginal ultrasound