When to test?

Hey, i am a little confused. My period was on Nov 23rd and lasted about 6 days. I ended up having unprotected sex and had to take a plan B around the 29th I wanna say. Just a couple of days before i started to ovulate. I know they make your period late but it’s been 12 days and still no period. I don’t feel any pregnancy symptoms. When or should i take a test?