Erm ... 20 weeks and four days ago ... Dohh!! Look at a calendar and count backwards 20 weeks, then backwards 4 days - there is your estimated date of conception.
NOV. 8
June 16th
Subtract fourteen weeks (7 days x 14) from the date of the ultrasound.
May
32 days previously
31st March or thereabouts
Around Jan1st
99% probability it was between 10 weeks & 10 weeks and 4 days ago.
just 11wks and 6 days before october18
around march 21 but no one can be 100% certain
Somewhere between 3rd and 9th December 2005.
16 weeks and 5 days ago!!!
Believe the sonogram.
Ultrasound gives an estimate of the age of the foetus. At this stage of the pregnancy, it's quite accurate, but it's still only an estimate, and the date of conception could be a few days, even a week, away from the date 19 weeks and 2 days ago.