Hi, my ultrasound results show yolk sac mean at 3.7mm, gestational sac mean at 11mm, and crown rump at 1.6mm. I am 6 weeks 1 day from my LMP, but I know I ovulated 4 days later than usual in this cycle. Is my pregnancy viable?

What does your own medical practitioner have to say on the subject ?

I don't think anyone here is qualified to answer this question with any sort of accuracy. Things to remember, your gestational age is dependent on your LMP not ovulation. This can make things confusing and has for a good number of my friends. In the end 4 days isn't going to make a terribly large difference in things.

During the early pregnancy doctor visits for my kids (2yo, 4mo), the Ultrasound Tech would do their measurements, and the doctor would analyze the measurements and discus the results with us as well as forward the results on to the requesting physician. Book an appointment with your doctor/OB/GYN or whoever booked the test, they're better suited to answer these questions. The last thing we would want to do is give you inaccurate interpretations and give you false hope/despair.