Doctors count from the first day of your last period, LMC, as the first day of your pregnancy. In reality you typically will ovulate and become pregnant about 10-16 days after that. They also take into matter the length of your cycle, how long between periods. That's why 2 weeks early or 2 weeks late is considered normal for the prenatal period. As every woman ovulates on a different day of her cycle. A 12 week ultrasound will likely pinpoint how far along you are as most babies grow at the same rate for the first 3 months.
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2 weeks after sex the earliest.
Normal pregnancy is 40 weeks (37 to 42 weeks is accepted as normal) 40 - 8 weeks = 32 weeks - 1 day = 31 weeks 6 days
pregnancy tests will only detectafter 5 days of your missed period
About 14-15 weeks into pregnancy the fetus is about 9cm long so it was conceived 12-13 weeks ago.
1-2 weeks.