Gestational Age (by Medfolio)

The development of this mobile app was based on multiple information available from the American College of Obstetricians and Gynecologists (ACOG)(1), the U.S. Department of Health & Human Services(2) and U.S. National Library of Medicine(3). 

Therefore, the information displayed on the mobile app is not intended to replace a medical appointment nor should it be construed as a definitive medical diagnosis or consensual guideline.

Bibliography
(1) https://www.acog.org/Patients/FAQs/Routine-Tests-During-Pregnancy?IsMobileSet=false#why
(2) https://www.womenshealth.gov/pregnancy/youre-pregnant-now-what/prenatal-care-and-tests
(3) https://medlineplus.gov/prenatalcare.html