Request another growth scan?
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Not sure if it helps with your question, but if you are not happy with your midwife, you can ask to be changed to another one
Honestly, I would ask for a new midwife and also ask for another scan. Try to track your last period etc, but also remember that you, yourself will be bigger because it's your third baby. My baby is measuring in the 97 percentile and based on her measurements she should be due 2 weeks earlier. I also had early scans and they told me for sure when I was 9 weeks due to baby's growth at that stage. The further along the get, the less accurate the scan due date will be
If it would help you then yes ask for another scan or to change midwife. If baby does come early they can tell by looking at them if the dates was off. One of my sisters children was early based on their due date but when he was born he was clearly overdue and roughly matched with her date she thought. If youve no complications baby will come when theyre ready just make sure you go in and get checked if youre ever worried. Even if 9/10 midwives wont listen to you there will be one that will xx
Did you have a saying dating scan between 10 and 14 weeks? Those are quite accurate.