calm down, 3 days is a short period of time when dealing with replies for job applications, especially when you consider this case, where Google's HR department

calm down, 3 days is a short period of time when dealing with replies for job applications, especially when you consider this case, where Google's HR department has to deal with thousands of applications because of their popularity. What I would suggest you to do is wait for 7 days and then if you still haven't received anything, just drop them an email.