So confused 🤦‍♀️

2 weeks ago I went for an ultrasound and was told my due date is October 17th! Well according to my pregnancy apps, if my due date is the 17th then today I’m 9 weeks & 6 days.

Yesterday I had a checkup and the nurse used her little estimate wheel thing (🤦‍♀️😂) and said alright if you’re due the 17th then today you’re 9 weeks and 2 days (app said 9 weeks 5 days yesterday).. I asked her how being that my apps say otherwise and she looked at me like I was stupid? I’m just confused...