<human>: For school (collegiate level), we have student portals and register our classes from there. 

Yesterday, I checked my student portal, my registration said I can register up to 13 units. I had 12 registered at the time. I thought the main registration was going to be in mid September according to the advisors.

Today, I was doing the same 'ol things I always do on Mondays. Then I called my boyfriend and somewhere, he mentioned that today was the actual main registration in the late afternoon. The class I planned on registering for was waitlisted along with all of the possible choices. Apparently the unit cap was changed today. I didn't know because it's my first term here. 

Ending: Signed up for another class, got waitlisted as #1, but I have a ~2 hour gap between the next class. Oh well, better than nothing. And it's still part of my degree pattern.

Can you condense the text into a few key points?
<bot>: didn't check my student portal again, missed the chance to register for the classes I wanted, and ended up signing up for a least favorable one.