Harvard called my guidance counselor and she hasn’t been able to get back to them yet. Is this a good thing or no?
PS: Please ignore my username, made this account a while ago.
To clarify, is it a good thing that they called? I’ve heard such mixed things from other sources and would like some other perspectives.
I’m just really stressed about this and it might be misplaced.
For all we know it’s a simple question or missing info.
Your GC needs to reset priorities if “she hasn’t been able to get back to them yet” but found the time to tell you.
And as @lookingforward said, you can read nothing into it based upon what you have said.
From what I know–and its only a few data point from cases I am aware of, it is extremely rare for Harvard AO to contact a school GC for a specific candidate during the admissions. There is no reason for the AO to reach out for information on an applicant if the applicant is not under serious consideration for acceptance. Such late inquiry happened to my DD who was able to submit additional info that ultimately made the difference in her EA admission. I would suggest that OP and his/her GC treat this event with utmost urgency and seriousness—OP, you realize that you have already won the lottery of being a finalist; you are on the cusp of being admitted! This is once in a lifetime opportunity not to be squandered.
Don’t stress, but make sure the GC calls back 
Harvard admissions officers have described to interviewers during training that they have reached out to GCs and interviewers for additional color on applicants when they’re torn or confused by some of the data points presented in the application.
In a case study, one LOR used peculiar language to describe a candidate that otherwise was very strong, and so Harvard wanted to check if the GC had any insight into what the teacher/GC (I can’t remember if it was the GC or teacher who wrote the LOR) meant in the LOR.