2 or 4 weeks? So confused!

Lacy

Hi ladies! Just found out I’am pregnant yesterday due Jan 10. But I’am confused about how far along I’am. I know for a fact when we conceived which would make me only 2 weeks preggo. But when I enter my info in all of these <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy apps</a> they all add on two weeks making me 4 weeks pregnant. Why is this??? I’am totally new to all of this.