بسم الله الرحمن الرحيم
(1) It is not lawful to go to college or hospital after khula during iddah period.
(2) In case of pregnancy, iddah is over when the woman gives birth to the child; otherwise the iddah is to complete three haiz (menstruating cycle) after khula. If the khula was done during menses, then that particular period shall not be counted rather iddah shall start from the first period after khula takes place.
Allah knows Best!
Darul Uloom Deoband