Week 1?

I may have out the wrong date in for my glow <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">nurture</a> app. I found out on 6/16 that I am pregnant because I was suppose to get my period that day and just felt "off". Is that day 1 in here in glow? Or do I need to look at when conception occurred and edit my glow dates?