Understanding An OB Wheel When Pregnancy Dates Differ An obstetric wheel can indicate how many weeks and days pregnant someone is on a specific date, the date on which the pregnancy reaches 40 weeks and what the gestational age will be at a future appointment. The mathematical process is uncomplicated. https://journalgrid-businessfeed900.thezenweb.com/article-to-know-on-obg-wheel-and-why-it-is-trending-82729305