Hcg levels

Calissa

So basically, my doctor told me to prepare for the worst because when I had a ultrasound at 6 weeks 3 days (according to my last period) nothing but a sac was seen. I have irregular periods so I feel like maybe my dates are wrong. Well I had blood work done and my hcg levels went from 14799 on Friday, to 19454 on Monday. I’ve been worried all week. I have another ultrasound on the 14th. But should I be worried