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physicians normally guage a pregnancy in terms of weeks, 40 weeks. What 40 weeks means is from the day of your LMP (last menstrual period). 40 weeks: 40weeks * 7days/week = 2 â¦ 80days for a normal pregnancy.8 people found this useful.nswer   Forty weeks.    36 weeks is standard but not everyone carries until full term and some go past the 36 week mark.   Most doctors count 40 weeks from th â¦ e first day of your last period.
For example, crown-rump length (CRL) is 3-5 days, ultrasonography performed at 12-20 weeks of gestation is 7-10 days, at 20-30 weeks is 2 weeks, and after 30 weeks is 3 weeks. Thus, a pregnancy that is 35 weeks by a 31-week ultrasound could actually be anywhere from 32 weeks to 38 weeks (35 wk +/-3 wk).