Confirmed but told to come back. ??

Mospa • Mommy to a 2yo boy. Clomid treatments, and had a mc 2 months ago, now newly pregnant again. Stick with me, little one!
I had my Bloodtest to confirm pregnancy at my fertility center (I was on clomid) and they said I have a good level 285 mIU/ml of hCG. They told me to come back on Friday to see how it's rising.  Has anyone else had to do this? I am happy but didn't expect it. Any comment is helpful!