How many weeks/Due Date

I’m confused so on a couple of my <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy apps</a> it says I am 8 weeks and 4 days Pregnant. I got pregnant on July 19th and I am due April 12th 2021. I think I’m calculating the weeks wrong or something.

Am I 8 weeks and 4 days?