Help me understand please

Celis

So went to see dr on Thursday of last week and they didn’t see anything on sono I’m about five weeks I thought 🤷🏻‍♀️ well they saw nothing on sono they drew my blood then and today when I went in for my second HCG blood draw I was told my numbers are at 503 and we are hoping they double but is this ok or normal? Any words of wisdom will be much appreciated 😚