When should I go and take a pregnancy test?

So. I had this encounter with this one individual, and I do believe that it took place on a Thursday May 30th. And it's now the the 28th of May. But of course I took Plan B. But how much longer should I wait, I'm anxious. Like if I took the pill I should be fine like the pharmacy said. But she definitely told me to wait she just didn't give me a estimate of how long. So any advice?
When should I go and take a pregnancy test?
Post Opinion