how come when i poke

[briansauras]

ill give my pin its last push until its empty and as soon as i let off it sucks like a bubble or 2 of blood into the colored part of the pin?

[speedtraining]

are you aspirating.

[Bizz]

if you did aspirate there no prob it just on your way in you wend trough a vein so wend you take the needle out there blood going inthe needle there not big deal! don't worry make sure you aspirate 'doe'

Bizz

[Hard Head]

Hold the plunger down and the pin in place for 15 seconds after your injection is finished. See if that helps you, it did for me.