Picking up?? Pharmacy??

So I'm getting my BC prescription for the first time today, and I was wondering if anyone knew like...what do you say at the counter?? Like "I'd like a prescription for (insert name here)" and so on?

I'm still a bit young and this is really nerve racking to me.

Also, how long would a QFC pharmacy hold prescriptions? I've looked all over google and found nothing!

I'm seriously panicking cuz I have to do this at the end of the day today!

Someone please help meeeeee