Well i would say that the second one is probably more accurate. They would have measured the pregnancy and would have been able to guess approximately how far along it was and so what an accurate due date would be. The best way to tell is to count 38 weeks from implantation and that should give u a due date.
If you went by the date of the frozen transfer your due date should be march 3rd. It depends on when the egg was fertilized. I would go with the ultrasound date because the babies would have been measured and an accurate date to be given.
some doctors count differently to others hunny, they can't ever seem to agree on a date lol. I have had my due date change up to 4 times in previous pregnancies and 3 times already during this one! Some doctors will go by your ovulation date and when you likely concieved and the others may have gone by your LMP, or when you strted your cycle, sorry I am a bit vague on how IVF works. I am however glad you have been successful and congratulations muchly on the news of twins yay! I hope this was a little helpful and good luck to you and all the best for your pregnancy! :) x
Thanks Ladies and good luck to you all