I have not receiced FP notice. When to start worrying?

July_2003

Registered Users (C)
I checked trackitt.com and everybody there with RD from the beginning of May have already received their FP notices. My RD id 05/02/07, but I still don't have it.
I am going for vacation very soon. When should I start to worry?
How to contact USCIS in order to check my appointment date?
 
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