Has anyone had hcg level 15 and bop

My spouse transferred 2 embryos on 11/22 went on Friday for blood work level was at a 10. However they said it was positive but very low hcg. They said they like to see at least 30. Went today level went up to 15. However they want us to go back on Tuesday to out rule chemical pregnancy. Has anyone experienced something similar and ended up with a confirmed bfp. We are very anxious but I am still trying to be positive since the level did go up. Any feedback would be greatly appreciated. Tx