Change of Major: Chemistry to Engineering

So I just got accepted into UCI for Chemistry, but not Chemical Engineering which was my first pick. I’ve been talking with counselors and no one really seems to have an actual answer. I’m a transfer coming from a CC and wanted to know if anyone has had or anyone knows someone with experience switching into the college of engineering after the school year has started, how long it took, and what are the chances of being able to change my major after the school year has started.