i have a photo of an 8week ultrasound in my profile
at 8 weeks its supposed to be 29mm
im confused
did they did the ultrasound at 6 weeks from lmp or at 8 weeks from lmp????
cause you asked for how much is supposed to measure at 8 weeks but you also said that it was measuring 6.3mm on her 6 week ultrasound???
at 6 weeks the gestational sac is supposed to measure about 14mm
is not much of a difference so i would say everything is probably alright, my gestational sac was measuring for 6 weeks when i was supposed to be 8 weeks from LMP becuase i actually ovulated late.
gestational sac per weeks:
4 3
5 6
6 14
7 27
8 29
9 33
10
11
12
13
at 5 weeks the gestational sac measures 6mm, so maybe on her 6 week ultrasound she was actually about 5 weeks aprox
not everybody ovulates on day 14 i ussually ovulated at about day 27
remember pregnancy is counted from LMP (last menstrual period) and if she dosent have a regular 28 day cycle every month she would not be 8 weeks now maybe she ovulated a bit later and she is actually about 7 weeks now.
maybe she ovulated in day 20 or something like that of her cycle instead of day 14.
i dont know why the DR didint explained to you or her that she could just had ovulated a few days later and that everything would probably be ok.
i guess you will just have to wait till the next ultrasound to find out for sure but don't stress to much, i really think everything is ok.
Good luck
maybe she is not as far along as she thought, not everybody ovulates on day `14, did they see anything else on the sac.