Sometimes I have to sign out and back in to see what I just posted. I don’t think its a screening thing - just a software vs my browser thing.
My very first post was screened, and from then on things posted immediately. I suspect the same will happen for you. I assume this protects the site from robots, without having to decipher those crazy text images with every post.
I can’t remember being screened on my first post, but
then in those days, we had to put the words on the screen
in hand set type, not this fancy linotype stuff either.