Last menstrual period ultrasound dating
In the first few weeks, fetuses tend to develop at the same rate.
However, as pregnancy progresses, the rates of fetal growth begin to vary from pregnancy to pregnancy.
This is not an indication of a security issue such as a virus or attack.In these cases, a pregnancy wheel can still be used, but some simple calculations are necessary.The second half of a woman’s menstrual cycle always lasts for 14 days.Once you have a general idea of when you ovulated, you can use an adjusted LMP to find your due date with a pregnancy wheel.For example, if your menstrual cycle is usually 35 days long and the first day of your LMP was November 1: After you calculate your adjusted LMP date, simply mark it on the pregnancy wheel and then look at the date where the line crosses. Some pregnancy wheels may allow you to enter the date of conception — which occurs within 72 hours of ovulation — instead of the date of your LMP.