Hcg level

I got my hcg blood test at 14-15 days past ovulation. It was 56 and she’s fine with the number. So my dr says I’m about 3.5-4 weeks. does this sound rite? . I asked for another script to recheck it to make sure it’s rising, she gave me the script but said for me to not go till another 2 weeks?

Please anyone with insight I’m kinda freaking out as far as the weeks. I have other children but never really have worried about it before.

TIA 🙏🏻