Here you can calculate you’re due date. You have to fill in the first day of your last period. When you had your first scan around 10 weeks your due date is definite. However, this date stays an indication of when the baby is going to be born. The normal period in which you can expect your baby is between 37 an 42 weeks, that means 3 weeks before until 2 weeks after your due date.
Your due date is based on the first day of your last period and on your menstrual cycle length
What was the first day of your last period?
What was your menstrual cycle length over the last three months?