Is it bad?

🌼FullTimeMomma🦕 • 💪Momma of 5🖐3 Boys 2 Girls 💙J.C.A.S💚A.L.S💛S.R.S💜L.M.S🧡M.A.J.S

What does is mean when from the first day of you last period was Feb 28 which would out me at 10 week 3 days with a due date of December 5th. Got a sono today and they told me baby was measuring 9 weeks 2 days changed the due date to Dec 11th ( my daughters bday) heartrate was 181.

And we saw the baby waving to us! It was so cute