Don't worry too much!! Just give everything to God. No matter what do trust in Him.
Dear God,
We know that tcally at this moment is very worry about the baby. Dear God, please listen to our prayers and we know that you are our creator and you will give the very best thing to us. Lord, I pray that you will give the comfort to tcally and may the peace of God be with her always. Pray in Jesus name, Amen.
How about the size of the baby? When I was pregnant, my case was the same as you. Since my “M” is irregular; the due date cannot count based on it. As it is your first time checking, the result of weeks may be incorrect.
I really understand your feeling. Let's trust God will give us the best no matter the result it is
God has the best plan for you and your baby. He is always in control, and He is our loving Heavenly Father. I had the same experience, and know that it is a very hard time for you. I pray that you can have the peace from God. God always works wonders in our life.