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May
Subtract fourteen weeks (7 days x 14) from the date of the ultrasound.
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.
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.
April
16 weeks and 5 days ago!!!