Hcg levels

So I had my hcg levels checked at 4 weeks and 3 days and it was 1,100. I then had it checked a week later and it is 40,082!!! I looked some things up as to why it could be so high and one could have been from a previous miscarriage, which I didn't have so we can cross that off, the other could be multiple pregnancies meaning twins or more and twins do run on my husbands side. I'm kind of freaking out but it's a good freaking out. Anyone had an experience with any of this? Advice would be appreciated!