How do you calculate the number of weeks pregnant?

The number of weeks pregnant is typically calculated by determining the number of weeks that have elapsed since the first day of the last menstrual period (LMP). Pregnancy is measured from the LMP because it is often difficult to determine the exact day of conception. To calculate the number of weeks, you can count the number of weeks from the LMP to the present day or use a pregnancy calculator tool that takes into account the LMP and provides an estimated number of weeks. However, it's important to note that this method provides an estimate, and the most accurate determination of gestational age is obtained through early ultrasound measurements. Consult with your healthcare provider for personalized information regarding the number of weeks pregnant and the progress of your pregnancy.