HCG and finding a gestational sac

Hi ladies,

I’ve been going for my serial HCGs and they have been doubling every 48-72 hours I had an ultrasound today and they said they couldn’t find a gestational sac. I’m 5 wks 5 days and my HCG is 2,535. The Dr wasn’t concerned and said it was just to early to see anything but me freaking out I look everything up on google and it said that after your HCG being 1,800 you should be able to see a gestational sac. Has anyone experienced this and everything was ok? Or should I worry ?