Attempts to establish initial contact with assigned practicum preceptor unsuccessful

I am looking for some guidance and am hoping that there is someone out there who has experienced a similar situation. I was recently assigned a preceptor for my leadership practicum experience on a floor perfectly matched to my future specialty. I was beyond ecstatic (quite literally jumping with joy) when I discovered that I had been assigned to my first choice of unit for the practicum. I attempted to make initial contact with my assigned preceptor last Monday, as we were instructed by our course clinical faculty member to contact our preceptors on the same day that we received our unit assignments. We were also told to send a follow-up email if we did not hear back by Thursday of last week. I did not hear back by Thursday, so I sent a follow-up email, as instructed. I also wrote to my clinical faculty member on Friday to inform her of my failed attempts, and she stated that she would try to reach my preceptor to remind her of the summer semester time constraint. It is now Saturday evening, and I have yet to hear back from my assigned preceptor.

Now, I will certainly admit to being a bit neurotic at times but feel that the considerable amount of anxiety that I am experiencing regarding this situation is somewhat warranted. Especially since we are required to complete 82 leadership practicum hours and must find a way to schedule these hours around our 90-hour adults II clinical and two other regularly scheduled classes (leadership and adults II in-class lectures) that meet for approximately 12 hours total per week. Granted, it has only been six days since I sent the first email, so it is certainly possible that my concern is a bit premature. It's just that all of my peers in my clinical group have already successfully established contact with their assigned preceptors and have either begun their practicums, or are due to start early next week.

I am so eager to start practicum and firmly believe that it is a privilege to have been granted the opportunity to shadow/work with this particular preceptor in my specialty area. I have been looking forward to the experience, but suppose that I am curious as to whether what I am encountering in regards to communication is typical, or if it is more of a rare occurrence. If you have indeed experienced something similar, how did you go about handling it? It may be worth noting that I completed a clinical rotation on my assigned preceptors unit in the fall of 2015. Despite having never met her in person, I already have a great deal respect for her, as many of her co-workers spoke very highly of her while I was on the unit. I certainly do not want to be a bother and the last thing that I want to do is make a bad first impression. Any input, suggestions, or advice that you can offer would be very much appreciated.