This tool is used like a prenatal calendar, which provides a better overall view of the entire pregnancy and avoids complicated calculations. Indeed, during pregnancy, it is important, in addition to the preconception consultation or your first fetal ultrasound, to have medical follow-up with your various healthcare professionals. In particular, using a pregnancy wheel allows you to know at a glance certain key dates: The age (in weeks) of the pregnancy The ideal times for consultations The ideal times for ultrasounds The periods for screening for trisomy 21, diabetes, and group B strep When to declare the pregnancy to Social Security and the Family Allowance Fund (CAF) The estimated due date