16 DPO and Beta of 25

Megan
I went in for some blood work and my doc told me she would consider me pregnant; however, my beta level was only 25 and that she wants to see me in two days. I am worried. Has anyone had low hcg levels and ended up with a successful pregnancy. To my knowledge this is the first time I have ever had a fertilized egg so to be honest either way I am happy. DH and I have been TTC for a year and a half and we were beginning to think it would never happen! Any advice would be great! Thanks!