AF two days late..

I did have intercourse with my SO on my fertile window date 11/30/17 , took a pregnancy test 8dpo and BFN. AF was supposed to start 12/15/17 , but nothing. No signs. Should I retest and when?

thanks in advanced for advice ladies! 😘

***UPDATE***

not much since I posted yesterday , but today is making 3 days AF is late 🤔 still havent taken another test , debating on taking some today but sorta nervous.. I might just wait it out a few more days.. But I am praying and hoping to be pregnant! 😁🤞🏽

thanks again for reading ladies!