To calculate your current week of pregnancy, you need to know the number of weeks that have passed since August 13th. As each week consists of seven days, you can divide the number of days that have passed by seven to get an estimate. For example, if it has been 56 days since August 13th, you would divide 56 by seven to find that approximately eight weeks have passed. Adding this to your initial nine weeks and three days, you would be approximately seventeen weeks and three days pregnant currently. It's important to note that this is just an estimate and may not be entirely accurate. Consult with your healthcare provider for a more precise calculation based on ultrasound or other medical examinations.