need a reply pls.

hello!

i just need an immediate reply from you all.my problem now is my that few weeks ago i recieved an email from ms sabrina confirming that i can now register to pearson vue but what im worried of is i have'nt submitted my resignation letter to my current hospital and it takes 3 months for the effectivity otherwise i need to pay to them. And my qustions are stated below.

1.) Is it ok not register as of the moment?
2.) how long is the validity of my eligibility?
3.) After registering to pearson vue how long for the ATT to be valid?


thank you so much!