scan puts me at 8 weeks but i was sure i concieved 6 weeks ago?

[dontstopthemusic]

This is a post for dsis, she's been ttc for a while now and doing ovulation tests etc.. had an early scan due to pains and small amounts of blood.
scan put her at 8 weeks but she says she conceived 6 weeks ago, 8 weeks ago would have been her lmp.
Am I right in thinking that all sounds fine and as far as I remember don't they add 2 weeks?
She says doc never mentioned them adding 2 weeks so she's just looking for some reassurance that they haven't messed up her dates.

[Taura]

They class the "Start Date" as the first day of your (her) last menstrual period, which on a 28-ish day cycle is 2 weeks before you actually conceive. So you can technically celebrate being pregnant before sperm even meets egg :)

[afreshstartplease]

I thinks it starts from when the egg is released not fertilised

[monkhelz82]

The 40 weeks presumed to be the standard length of a human pregnancy are calculated from the first day of the last period, so six weeks since conception/eight weeks pregnant would be the same thing. :)

[dontstopthemusic]

Yeah I thought so! She won't take my word for it though! Ive only done it twice myself so what would I know hey addmitedly that was some time ago now