Don't worry too much. Did you receive a tracking number from the post office or shipping service you used (so you know it has actually arrived)? Like others said, it usually takes from a week to a month to hear anything. Also, check your bank account for the funds to be withdrawn. I'm in the same boat. I sent in our papers and such for our adjustment of status for my wife (she came on a K1 also) the same day as you. Don't worry too much, things will be fine.
You sent it on June 19th? Well, from what I see its only been 4 business days (Don't count weekend days) It can take a week or even a month but normally it is a week or 2. Just be patient, this is the first step in a long journey. Patient is something you really 'lots' of!! This is not a quick process, and even if you pass one hurdle fairly quickly its seem to make up for it in another step. In this day of 'instant technology' we are spoiled with instant replies and stuff. I would suggest you start getting the next set of docs ready for after your NOA2 and then just try and keep your mind off of it for a while. In my situation, I tried to stay off of VJ as much as possible because it really caused me undo distress and worries, BUT, that is just me. Good luck in your journey!!!
Someone correct me if I'm wrong, but typically the timeline goes much like this:
Send Petition
Receive Electronic Notification of acceptance [Typically within 24-48 hours of your file being delivered to the drop box -- varies on postal delivery]
Receive NoA1 [Typically within 1-2 Weeks]
Wait...
Wait some more...
Keep waiting...
Wait some more... & when you're ready to tear your hair out or go stalk the USCIS office closest to you....
IF APPLICABLE
Electronic Notification of Transfer (email 1)
Electronic Notification of File being mail (email 2) [Typically within hours of email 1]
Receive NoA-T (Notice of Action Transfer) [Typically 1-2 weeks from email 1]
Electronic Notification of file received at new Service Center. [Typically 1-2 weeks from email 1]
RFE / Decision [Varies, but the Federal goal is 5 months, check processing times for your center -- note these do change regularly]
IF APPLICABLE
Electronic Notification of RFE
RFE in Snail Mail [Typically in about 2 weeks] Mail in RFE Response [Varies on you]
RFE Response Review [Typically within a week of them receiving your RFE Response, but it can vary] Decision [usually with 1 week of RFE Response Review, but it can vary]
Electronic Notification of your file being sent to NVC [typically 1-2 weeks]
Stalk NVC for Case number [2-6 weeks, used to be typically 2 weeks, recently they seem to be slow -- may change]
NVC Forwards your case to the Beneficiary's Embassy/Consulate [typically 2 week]
Embassy sends packet 3 [typically within a week of file being transferred]
Mail back completed Packet 3 [Depends on you]
Embassy sends packet 4 & Interview is scheduled [typically within 1-2 weeks of receiving packet 3]
Interview [Varies... depends on consulate/embassy, I would recommend checking your country's reviews to find out]
Visa is issued / Denial reason given / RFE
If Visa is issued, Visa is available for pickup/mailed [Typically within 2 weeks, but varies on embassy/consulate]