I have done 6 home pregnancy test all which are positive. But my blood test was low. Is that normal?

It isn't unusual. It just means you're in the early stages of pregnancy.

Congratulations!

As CravenMorhead said, if you are very early in a pregnancy, then it can be normal. A one time reading is not necessarily a concern (unless, perhaps, you are several weeks pregnant). Your doctor may suggest having another one done in a few days to check for the increase which would give them more information.

How far along does your doctor feel that you are and what was your level?

Agreed, it all depends on how far along the pregnancy is. Do you have an estimate of number of weeks.

6 test before you see a doctor is stressful over kill.