To determine how far along you are in your pregnancy based on your last menstrual period (LMP) of March 5, 2020, you can use the standard method of counting weeks. Counting from the first day of your LMP until the present date will give you an estimate of gestational age. As of today's date, subtract the LMP date and divide by seven to get the number of weeks elapsed. For example, if today is April 15th, you would subtract March 5th from April 15th (41 days), then divide by seven to get approximately six weeks. However, it's important to note that this is just an estimation and a healthcare provider can provide a more accurate assessment through ultrasound or other diagnostic methods. It is recommended to schedule an appointment with a healthcare professional for further evaluation and confirmation of your pregnancy duration.