Understanding An OB Wheel When Pregnancy Dates Differ An OB wheel can show 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://journalpath-onlineblog195.blog2freedom.com/43422687/the-most-spoken-article-on-pregnancy-wheel