If you have 3B monitoring, then your sores will update when something significant changes on your EQ, TU and EX report. Not all changes will cause myFICO to update your score. There is a page on this website that lists all possible changes for each CRA that triggers myFICO to recalculate your scores based on updated/changed information on your reports.
@hpotterfan77 wrote:I'm just curious if someone can answer this. I get quarterly reports available to me on here but I'm wondering if your score will update anytime when a card reports for the month as well and your score may change. Anyone know if this is the case or if I will have to wait until February to see my updated scores? lol
However, the score simulator only works on data collected from your last 3B report.
balance changes will...account falling off won't until a trigger event happens. Balance changes need to be over a certain threshold 5 dollars on EQ Some percentage I believe for EX and TU. Credit karma is prob better for the simple monitoring of EQ and TU reports, I often know something happened from them way before my fico. For examplemy last my fico alert was an inquiry on TU that increased my score 17 points. Kinda doubt that was the cause of the jump 
but no trigger events had occured for almost 3 weeks, but in that period 3 inquiries went over the year threshold and 2 accounts aged over the 12 month mark as well as my dreadful AAoA hitting a year.