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And your periods may have been pretty irregular prior to conception.In such cases, a scan at the earliest opportunity will give a clue as to the potential delivery date.Pregnancy dating with ultrasound is best done in the first trimester, at around 11 to 13 weeks.Scans done at this point have the highest degree of accuracy in estimating the due date, with only a small margin of error.Even when you can remember when your last menstrual period began, ultrasound can still be more accurate than relying on your last period date alone.
ALSO READ: Safe exercises to close your belly gap after pregnancy The due date should be agreed on pretty early in the pregnancy, preferably by a first trimester dating scan.
An ultrasound can help you determine how far along you are in your pregnancy.
Before you consider abortion or seek an abortion clinic, it is important to know how many weeks pregnant you are (the gestational age).
You should then come up with the best estimate which you should stick to.
Any other suggested dates, especially if based on scans done in advanced pregnancy, can just be ignored.