... 253... do i put it on the 4 ( Which is the dosage I have taken ) or does the syringe go by tenths.In other words do i put it on 40 instead?

I am worried i have'nt taken enough,but at the same time do'nt want to take too much either. It is the syringe numbers that confuses me,with them going up to 50 and all,i mean.

please help soon?