Did anyone here start off as a phlebotomist?

I’m currently studying and I’m not immune to hepatitis b even though I had my two vaccines as a teenager. I’m on in my late 20s now.
Has anyone been in this situation with needing to get the vaccines again but running short on time? (I have 4 months to complete a certain amount of live bleeds before I can go on work placement) I’ve been told an extra load (2 boosters 1-2 weeks apart?) thanks all!!

(Also I am going onto lab technician course next year) then fingers crossed university for the science course!!)