When I originally applied for my current position, I didn't hear about about a possible interview for about 3 weeks. In that 3rd week I called HR and checked on my application and they informed me that at the time they already hired the staff they needed. I was really bummed but I have my original job (a retail position) anyway. So, because of the open communication with the HR recruiter, when another spot for my current position was available, the HR recruiter decided to call me first since we had been in contact with each other. My best advice, call in after about a weeks time to check in on your application and see what they say. If they are unable to provide you with an interview, just thank them for the opportunity.