Wait, What? (Cooper call)

I got my call after my blood work today,
Progesterone- 20 something
Estrogen- 20 something
Beta- Negative (as expected)

(I don't have the exact numbers as I was listening to the message and accidentally erased it! Grrr!)

Instructions: Go off the meds, get AF, come in day 2 or 3.

OK, got it. (I had asked about continuing P. to delay AF just enough to make sure I could get down there but there was no message about that... I'll take one P tonight and ask tomorrow.)

So here is the confusing part: She said that if I don't get AF by Wednesday to go take a beta again to make sure I am not PG.

Wait, wait? But my beta was negative... day 14 after trigger... so at least 13 after release... which they don't think I did.

So, why would she say retest?
I am confused!

I'm I clear to have my beer tonight or not???

Thank you, Ladies!
Sara H.