Unsure

Hi, I'm 30 & we're ttc for baby #1. This would be our 5th cycle trying after being on the pill for 14yrs! 
My AF is now 3/4 days late. I took a test 3 days ago & got a BFN! I'm trying to hold out a bit longer before testing again to avoid disappointment! No symptoms at all really 😕 how long should I leave it?