So my due date is the 15th according to my dating scan which means today I am 8 weeks 6days. I went to book my gender scan and they have their own "type your due date and we we calculate" section so I did that and it's saying I'm 9 weeks 2 days today instead.

Now the scan I'm going to I have to be at least 14 weeks. Do I go based off my date or theirs?

Also if I'm going off mine, does one day matter since they don't have the day I am 14 weeks available but they have the day before available and I'll be 13 weeks 6 days based off my dating scan.