silly question, page-5

you have three trading days from purchase to ensure that the money it cost to buy is in the account that the broker will go to to find it. Selling your stock today won't make any difference because your sale won't get into your account until three days later, and it will be AFTER the purchase money will be needed.

you'll get hit with a reversal fee if there's no dough in the acc after T+3

(or maybe they'll just cut your nuts off)