Understanding Your Due Date & Gestational Age: A Pregnancy FAQ

Question
Hi, im abit confused with my duedate as my last period wa 3rd july 07 and i worked out my duedate would be 8th april, but when i had a ultrasound the sonographer said the machine measured my baby to be 8week 6days but he was putting it back a week i dont no why, so he gave me a duedate of 17th april but with that date im measuring 2week infront and had an ultrasound at 29week and said the baby was measuring 75%centile i dont no what this means. Should i go with the 8th or 17th of april. Thankyou

Answer
Dear Jai

Please provide me with the first day of your last period and the length of ur cycle so that I can calculate it accurately and see if it coincides with ultrasound or not. Generally, if you are sure about your dates, your words should be more accurate than sonar provided that no contraceptive pills were used directly before pregnancy and ur sure of your dates.