I have this problem too. My GP gave me a date of 17th of June based on the LMP stuff - but she used a 28 day cycle and I'm 31 day cycle. So by my calculations I would be due on the 20th June. At first US I was told due date of 24th June. I was reading my referral for hospital the other day and it has 26th June written on it!!! I've never been given that date, where did that come from???

Do you think they'll believe me that the due date is 20th June? I'm a bit annoyed that there's a date on my paperwork that has never been mentioned and isn't right. I don't want to run the risk of going up to 3-4 weeks over because their dates aren't right - there are significant risks once over 42 wks as the placenta gets 'old'.