Thanks for the query.
Urine pregnancy test kits sometimes may not detect early pregnancy due to less sensitivity.
So as your blood test
came positive it can be said that you are pregnant.
At present you are of 5 weeks gestational age
from last menstrual period.
And your HCG levels are at borderline range. So you wait for one more week and go for repeat HCG levels and ultrasound
which will clarify the situation.
Meanwhile if you get pain abdomen and spotting increases consult your doctor to rule out miscarriage