
I like to go at around 30 days, hoping for a 100% confirmation of pregnancy. This without having done the progesterone test, however, and therefore I can't be certain of the date of ovulation. That's why I don't want to do the ultrasound too early. Referring to your question, I would not wait another whole week, however, as you'd be at day 34, which seems to me a bit long. If you are sure about the date of ovulation, I should think you would be able to confirm pregnancy on day 27, especially with a brilliant scanner performing the examination.