Hcg question

This might be a really dumb question but does anyone know if the hcg tests they run at the doctor are the same as the ones they run at the hospital? Only reason I'm wondering is I was tested at the doc on Monday (4/4) and my levels were 109, went back in to doc on Wednesday (4/6) they were 149 and then went back in today (4/8) and they were 100 but I was tested at the hospital and didn't know if that made a difference.....really wanting everything to be okay as I've been ttc for over a year and this was the first positive pregnancy I've gotten :(