Baby may just be big but you may have ovulated earlier then what the doctors think. A due day is never accurate, its just a guess. If you go online do a search for different types of due date calculator.
Ya if your periods are not always the same # of days then its hard to tell sometimes but its normally pretty accurate to go off the ultrasound as the earlier ones are most accurate. My dr based my due date off when I ovulated since my periods ranged from 26-31 days. If you know when you ovulated then you can base it off that but I would say you are 17 weeks. Again like the pp said they are really just a guess and honestly on 3-4% of babies are due on their due date.
Copyright 1994-2016MedHelp International.All rights reserved. MedHelp is a division of Aptus Health.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.