My exp says that with babies this early.. the U/S machines are not really very accurate to date them. The sizing of the baby is done with Dr marking two end points(head to rump). With babies this small even a mm makes a diff in determining their age.
Please do not worry too much .. thats the last thing u need at this stage. Stay +ve and things will follow.
http://baby2see.com/development/week8.html
Check out this site. I would say you are about 8 weeks if you triggered 6 weeks ago. Are you sure your Dr didn't say 15mm, because I did the conversion and it said that would be 150mm which is way too big. According to the site your baby should be 18mm, and if you implanted late you are probly right on target.
I looked online too, and not having much luck.... well the good news is that they found a yolk sac and that everything is there! : ) thats half the battle sometimes! Keep me updated and you and your family are in my prayers! Have you checked out the misdiagnosedmiscarriage.com website.. it has a lot of info and a lot of success stories of people measuring behind that had perfect outcomes! its inspiring to read! GOOD LUCK keep me updated and i'm praying for you!
he didn't say how many days or what not behind he asked when the nurse gave me my progesterone suppositiores if i started when i got pregnant or after ovulation and they were started after i found out. he said i go back next week to see and to keep taking those suppositories. I can't find anything online about yolk sac measurements
I'm not sure how to date using cm's... I know when i went in that my dr said i was "this many days behind" etc.. did they say that at all? what did your dr tell you to do or say overall? if he didn't seem worried i'm sure its all fine! first of all ultrasounds esp in early pregnancy can be +/- 4 days off, then you can have the late implantation, or sometimes just a slow initial bean that catches up and everything works out just fine! : ) Did they set you up for a follow up?
if he goes by ovulation because i had the trigger around 6 weeks it says im .15 cm. i just dunno what to even think anymore im a nervous wreck