Planning to have a baby is exciting and anxiety producing at the same time. For those using home pregnancy test kits, their emotions are closely tied to whether the strip turns color or shows an extra band indicating pregnancy. The pregnancy due date calculator is for individuals who just cannot wait to see their doctor to find out their due date. In a matter of seconds, by entering the first day of your last period and clicking the Calculate button, you can estimate the birth of your long-waited baby. To verify pregnancy and to obtain a more accurate due date, you need to see your obstetrician.