Re: Accuracy of early ultrasound
My doctor explained to me that the earlier the sonogram for dating, the more accurate it is. My doctor also told me after 9 weeks, the accuracy starts going downhill.
I had no clue how far along I was when I found out I was preganant (no menstrual cycle present due to depo shot). Doctor used a combination of bloodwork (for hormone levels) and sonogram measurements to determine I was 7 weeks at the time. He also explained that his calculations on my EDD are far more accurate than any menstrual cycle info I could have provided because it's based on medical data and not guestimates.
Good luck! Gayle