“How far along” question

Jessica • Due July 2018 💕

When everyone posts that they are 4 weeks or 5 weeks etc are you all going by what this app says? I found out yesterday that I’m pregnant 😍 so I have to wait until tomorrow to call my doctor. This app says I’m 3 weeks and 5 days but I know that’s how long it’s been since the first day of my LMP. I know the weeks are calculated weird but are they always calculated like that? Would my doctor call me about 4-5 weeks or would she say 1-2 since that’s when I conceived? It’s all so confusing to me!!!!