Pregnancy takes about 9 months and 10 days. So we can say it’s a 40-week journey. It will be good to follow baby’s growth week by week. Medically, beginning of your pregnancy is determined as the first day of the last period you saw in your menstrual cycle where you get pregnant. In fact, the first week of pregnancy is a week when you are not yet pregnant.
Therefore, the week count you have made according to the date you get pregnant is two weeks behind the week of your pregnancy which specified by your doctor. For example, based on your calculations you may think you are pregnant for 3 weeks, but your doctor will tell you that you are actually 5 weeks pregnant.
You may not know the exact date when you get pregnant, so the doctors will make their calculations according to the first day of your last period in order to follow your pregnancy. Medically, the calculation of the week of pregnancy is done by assuming that ovulation occurs on the 14th day of the menstrual cycle. The time of ovulation varies from woman to woman. Ovulation in a woman may be earlier or later. You can learn about pregnancy stages and get week by week pregnancy information in our website.