Conception is calculated 14 days after the first day of your last normal menstrual period , if the sonogram said 9weeks and 3 days on 04/15/21 you most likely conceived about 7 weeks and 3days prior to that date ,keeping in mind that the sonogram can be a few days off. The whole pregnancy is 40 weeks starting from the first day of you LMP ,so is better to correlate both dates and size.
Answered 7/26/2021
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