Trigger hcg shot

Lisa • Praying for a miracle
I had the trigger shot October 13th. I had my 1st IUI the next day. My progesterone shows I ovulated and my result was 18.1
I'm due for my period today according to this app and another. I've had all kinds if pregnancy symptoms for the past week. Nausea and vomiting today.  I'm due to test to see if I'm pregnant on Tuesday. 
I haven't gotten my period yet and I'm glad. But I was wondering how many days after trigger does a period come if not pregnant? I'm so paranoid. 
I've struggled with infertility for a year and a half and have praying my heart out that I'm pregnant.