Pregnancy weeks?

Anna
If a chart says I'm 3 weeks & 6 days, but my fetus is 2 weeks old how does that work?
​Like I ovulated only 13 days ago. Why do they say it's almost 4 weeks even if I wasn't pregnant than? What will they go off of? My last period on April 23, or my ovulation date of May 23, cuz that will make my due dates jan 24 and feb 13.

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