Stressing.

So I recently had sex with a good friend of mine and we didn't use any protection, but I am on birth control (I have a IUD) but he still didn't fully pull out in time & I had just gotten off my period a few days before it happened. & I know that the pull out method is not always the best. It's only been a week but I'm not sure what I should do? Should I just wait it out or test it soon?