Hello, mamas! Here's the thing: I had an ultrasound two weeks ago on M…

Hello, mamas! Here's the thing: I had an ultrasound two weeks ago on Monday. The ultrasound dated me at 10 weeks and 1 day. So this week the gestational age should already be 12 weeks. But when I had the screening today they told me 12 weeks and 1 day. Today is Wednesday, so it should be 12 weeks and 3 days, right? Or am I calculating something wrong?