For dating purposes, the first month of your pregnancy is actually calculated by the first day of your last menstrual period. It counts the weeks prior to ovulation, even though you were not pregnant at that time. Doing this helps the doctor estimate your due date. You can calculate your date at home, prior to your first visit. Count nine months from the date of your last period. Then add seven days. This will be your estimated due date.  

As the labor coach, you have an important role on the big day. You need to be there to support her during labor. Learn as much as possible about labor and child birth to be the most effective coach you can be. It’s hard to say just what she will need during labor. Realize that all women are different and be prepared to meet her needs. These needs may change many times throughout the process.