Final answer:
When a needle is not properly in the vein, the correct action is to withdraw it, apply pressure, then attempt re-insertion at a different site while maintaining a sterile technique.
Step-by-step explanation:
If the needle is too shallow and not in the vein, you should withdraw the needle and apply pressure to the site to prevent bleeding and bruising. After ensuring that the initial puncture site has stopped bleeding, attempt to re-insert the needle at a different site, making sure to palpate the vein properly and insert the needle at the correct angle. It is important to reassure the patient and maintain sterile technique throughout the process to minimize discomfort and prevent infection.