BW is back. The Beta confirms she is

!!!! However, they are a little concerned. The IUI was done on 06/17. The Beta today showed a level of 25.2. The nurse said it was nothing to get alarmed about, but we were on the lower end of normal. She has to repeat the Beta on Monday to make sure it is doubling.
Does anyone know if the Beta starts from IUI date or implantation date? The nurse said that he/she may have implanted a little later than what they have as their target, thus resulting in a lower beta score. The told us not to freak out over it because it was still normal, just on the lower end. The repeat Beta will be Monday morning. I'll keep you posted. Please pray that we will have good numbers Monday! The nurse said it needs to be greater than 50.