Due date mix up??

I went to the er when I was around 9 weeks. And they did a full measure of the baby while I was there (it was an er for pregnant women) and they gave me the due date of 04/20. I went to an ultrasound appointment yesterday the app was telling me I was 12 weeks and 1 day based off of the due date 04/20. At my ultrasound appointment they based it off of my last period which mean I would have only been 11 weeks 5 days. And my due date would be 04/23. She did measure the baby but she didn’t change anything or say anything to me… So should I keep the 04/20 or should I change it in the app to 04/23